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• Postfix auto create Maildir

  - by Eugene

  I've been beating my head against a wall for a while now on this one. Basically, here is the rundown: Our MX record points to a frontend SMTP server, which contains aliases for actually routing the mail. No alias, no access to the backend storage server, which is what our clients connect to. I'm upgrading the backend email server. Currently, a user is created for every email user on the server, which creates the mailbox. On the new server, everything autheticates through PAM to an LDAP server (all of which is working properly). My goal is to get Postfix to create the Maildir directory for the user automatically. This works fine when I have the /home directory with 777 permissions, but for obvious reasons, this should be avoided. I would like to do this with 775 permissions on /home with a group owner of whatever user Postfix is running as, but I can't seem to figure out what user to use. With the 777 permissions, the /home/$user/Maildir directory is created on message delivery. Does anybody know how I can do this without 777 permissions? The system I am working on is a 64-bit Debian Lenny 5.07 install. Any advice would be appreciated.

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• what type of laptop do I need to run a amd64 or i386 VM?

  - by Frank Schwieterman

  I was running an amd64 build of Ubuntu on a VM on a Windows host which was also amd64. Later I found I could not run the same amd64 iso on my laptop, which is intel without hyper-V. I was confused I thought chipset mattered, but maybe it does not. When buying a PC or Apple, is there anything to check about the chipset to make sure it can run different types of VMs? In my case, I was trying to run ubuntu on a Thinkpad T520. Per answer below, I did need to enable some bios settings. I'm still having some issues. Running ubuntu on virtual box, when I try to use ubuntu-12.10-server-amd64.iso for the CD/DVD device to start a new VM, virtualbox complains "Failed to open the CD/DVD image . Could not get the storage format of the medium (VERR_NOT_SUPPORTED). When I try to use ubuntu-12.10-server-i386.iso the ISO is accepted, but then the VM complains "FATAL: No bootable medium found! System halted." I had been using an amd64 iso on my home PC which is amd64 and it works fine, which is why I suspected CPU mismatch was the problem at first. But it seems like I'm having issues, and maybe this superuser thread can be used to verify the cpu is irrelevant in this case.

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• Whats the best cloud backup solution for a small scale server environment?

  - by nbv4

  I have a server that runs a postgres database that contains about 200MB of data. Currently I have a cron job setup on my home computer which: ssh's into my server runs a remote script which makes a backup of the database scp's that dump over to my local hard drive for storage. Each dump is 20MiB. does this every six hours (one months of backups is roughly 2GiB) The problem with this setup is that if my local machine goes down for whatever reason, no backups will be made. Also, I can't have the cron run from the server, because I can't have it scp'd to my local machine from my server (firewalls and all that crap). My local machine is running Ubuntu 10.04, and my server is Ubuntu 9.10 server edition. I looked into Ubuntu One, but currently it's gui-only. I also looked into dropbox, but it's a pain in the ass to get setup in linux without gui support. Amazon S3 looks good but it's not free (yet dirt cheap). Is there any other alternative that I should look into? I'd prefer something where I can just have my script dump the database into a directory, and have the backup service 'watch' that folder and sync accordingly. I can maybe also have my local machine sync to the cloud backup so I have even more redundancy, plus easy access to my backups for use in testing. Edit: My server is a VPS, so what solution I end up using has to be 100% software based.

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• Disable internal display on Macbook Pro without closed lid mode?

  - by jslaker

  I have an early 2007 Macbook Pro running 10.5 that I've recently set up on a KVM with my primary desktop system. The problem I've run into is that I have a 20" 1680x1050 LCD, and OS X only provides options to mirror at the resolution of the built-in display or to span. Since the built-in display runs at 1440x900, this leads to running my LCD at non-native res and a fuzzy picture. There isn't any option that I can find to simply disable the built-in display entirely and run the external LCD at its native resolution. I am aware of closed lid mode, but the MBP was disassembled while in storage for about 6 months (took it apart to pull the HDD) and the cable to the touchpad, which controls the sleep sensor was damaged, meaning closed lid mode won't work. I've looked into replacing the cable, but the cheapest I've been able to find it is $75-100, and I'm trying not to invest any more money into this computer as it also has a completely dead battery and a few other minor problems. I've found the app SwitchResX which appears to allow you to do what I need, but it has a lot of functionality I don't need and a ~$20 registration charge attached to it. An odd set of circumstances, I'm aware, but I was hoping somebody might know of an OS hack that would let me just disable the internal display and be done with it. :)

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• HP/IBM alternative to Buffalo iSCSI TerraStation?

  - by Robin Day

  I'm looking at virtualising some of our infrastructure in order to allow for more resiliance and future expandability. We have successfully virtualised on single servers with Direct Attached Storage and are now looking for a more future proof solution using a high powered host (or two) and a SAN (or two). I'm thinking that the host machine will probably be an HP ProLiant DL360 G7 (all of our exisiting infrastructure is HP). Unfortunately, I am new to the world of SANs. From what I can see, the Buffalo Terrastation III is all I would need in order to setup an iSCSI SAN for VMWare to use. However, I'm a little reticent to go that way as it's a bit too "entry level" for my liking. In particular I would be very keen for more redundancy, power, networking, etc. I'm also very aware that you "get what you pay for". Therefore, can anyone reccommend equivalents from the big boys? HP/IBM? I have searched high and low on the HP site and seen many options but am struggling to work out if it is all the hardware I will need. Some options appear to need separate controllers from disk enclosures, etc.

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• Ubuntu+Win7--disk error press any key to restart

  - by Siddharth

  Apparently,none of the solutions in any other posts and forums worked for me For some reasons I decided to remove ubuntu from my hard disk drive. My partition table(presently): (/dev/sda1) (fat32) 900 MiB ---(MBR,I suppose) (/dev/sda2) (ntfs) 70 GiB -----(Windows 7) (/dev/sda3) (ntfs) 314.88 GiB --(Personal File storage) (/dev/sda4) (ext4) 80 GiB -----(Ubuntu 13.04) (unallocated) -----1.31 MiB So,after moving(cut-paste) everything(for backup) from the fat32 partition using win7..I booted into Ubuntu and copied the remaining 3 files(hidden in Win7 file explorer) --bootmgr,bootsect.bak,and one more which I do not remember.TERRIBLE MISTAKE After this I again booted into Windows and deleted ext4 partition..formatted it to ntfs..and shut down the pc.Then,I put in a Win7 bootable USB..using command prompt I entered bootrec /fixmbr,and bootrec /fixboot.. Restarting showed me the GRUB..choosing windows 7 showed me "Disk Error. Press any key to restart." I also installed a fresh Win7 installation on the 80 GiB partition expecting a Windows Legacy Bootloader with two win7 options..but did not work. Then..I used a Ubuntu LiveUSB to put it back to the present configuration(above) since all methods to restore the MBR failed.. I copied back the fat32 partitions backup files but couldn't copy those 3 files.Somehow ,they had been recreated and were non-replaceable. I do not want to format the win7 partition for a fresh one. I have used boot-repair..Restore MBR option brings back to "Disk error...." without even going through grub..so I reinstalled grub and I'm able to boot into Ubuntu. grub menu shows the win7 option as "Windows 7 (loader) (on /dev/sda1)". paste.ubuntu.com/5753710 paste.ubuntu.com/5775999

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• What hardware would I need (approx) to run ESXi server?

  - by mr.b

  Hi, I am considering to purchase off-the-shelf commodity hardware in order to build server that will host virtual machines using ESXi server. Intended purpose for this server is NOT mission critical tasks. It will have to run perhaps 20-50 Windows XP/Vista/7 virtual machines (in total, but closer to 20 figure). Each guest would have to have 1-2 GB of ram, and probably two-three times more disk space than guest OS needs with clean install and all updates applied (that would be around 6-8 GB for XP, and i believe closer to 10-15 for win7). Those guests will act as a test ground for a new product that is network management software, thus guests will idle most of their time once initially loaded, but if I give them some task to complete, they should be able to perform reasonably well. Now, from what I have learned... CPU is usually not much of an issue (6 cores would do it), memory should not be lacking, but doesn't have to be sum of all guests, because of overcommitment... That leads me to IO, which is, as it seems, the bottleneck. Since I have very little experience with ESXi (and ESX, too) server, I'd like to ask: How much memory could I save by overcommitment, and how does it affect performance? Is 6-core cpu enough to run above described system? Would it be possible to run entire server off two (or even one) SSD drives (to host system virtual disks, with few additional HDDs (2-3) in RAID 0 to be used as secondary storage? I read somewhere that ESXi allows having something like "master image", essentially virtual machine that is "deployed" many times, so that disk space can be saved by having only differences stored by specific guests, instead of copying around whole virtual disks. Is this true, and how can this help me? Are there any other things I need to take into consideration when building this off-the-shelf solution? I should probably mention here that I'm fully aware of issues like SPOF regarding power supply, raid 0, etc, but since it's only a testing ground and not a production system, it's not so important for me. Thanks, B.

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• Software raid 0 with six disks performance

  - by user134880

  I have some problems with disk performance. I have 6 x WD 500Gb RE4 disks. Each disk gives 135Mb/sec throughput. All measurements are made with hdparm with options "-tT" (I know that it is just synthetic test, but I need some start point to make measurements). I have controller with Sil3124 x 4 ports PCI Express 1x So... RAID0 on controller with 2 disks gives 200Mb/s - ok, pcie limit. RAID0 on motherboard with 2 disks gives 270Mb/s - niceeee :) RAID0 on contorller with 4 disks gives 200Mb/s - ok, pcie limit. RAID0 on controller with 4 disks + 1 disks on motherboard = 340Mb/s ... :( RAID0 on controller with 4 disks + 2 disks on motherboard = 300Mb/s .... why? Any ideas? Maybe need more cpu power? Now there is Pentium D Dual core 2.8Ghz, 4Gb RAM. It is dedicated box for storage.. no other activity.

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• Half of installed RAM is hardware reserved

  - by user968270

  After a rather arduous and convoluted series of problems that left me without a desktop for ~80 days, I've finally got the thing up and running, having replaced the power supply, motherboard, graphics card and CPU. Now, however, I'm experiencing the 'hardware reserved RAM' issue. Perhaps this is the exhaustion talking, but looking at the question that tends to get pointed to when this kind of topic gets locked as a duplicate hasn't helped. I have 16 GB of RAM installed in an MSi 970A-G46, which is spec'd for up to 32 GB of RAM. The BIOS recognizes that I have 16 GB installed, and the resource monitor also shows the whole 16 GB, only it shows 8 GB as hardware reserved. I've seen suggestions that it's an OS issue, but the particular installation of Windows 7 (64-bit) which I'm running on my boot drive is the same as the one that could actually access the 16 GB in my previous motherboard (MSi 870A-G54). I've updated my BIOS using the MSi Live Update tool and restarted the machine with no effect, and I cannot seem to locate any 'Memory Remapping' option as I've seen mentioned. I've physically swapped the RAM between the slots to no effect. I've unchecked the Maximum Memory box in the msconfig Boot tab's advanced options, also to no effect. These are my system's basic specifications OS: Windows 7 Home Premium (64-Bit) Motherboard: MSi 970A-G46 CPU: AMD FX-8150 Graphics Card: XFX Radeon HD 6870 Boot Drive: OCZ Agility 3 Storage Drive: Samsung Spinpoint F3 ST1000DM005/HD103SJ 1TB PSU: Thermaltake TR-2 TR600 600W ATX12V v2.3

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• What diagnostics are safe to run on an SSD drive?

  - by Peter Mounce

  I have a MacBook Pro (late 2010) with a Crucial RealSSD 256Gb in it; 60Gb is given to the Windows 7 x64 BootCamp partition. I have a USB-attached 500Gb drive for (most) data. In the last day or so, I've had a BSOD and several OS freezes (both Mac OSX 10.6.6 and Win7). The system in both cases will boot fine (at the moment!) and then run things fine, then some time later a program will stop responding, followed shortly thereafter by the system as a whole, forcing a reboot. This smacks to me of a storage problem. Given that I have an SSD and not a regular magnetic HDD, what are my next steps, in both OS'? I haven't seen anything pertinent in Windows' event-log. I'm not sure of the equivalent place to look in OSX; it's never given me issue to find out. What are my options for attempting to save my data from the SSD to another drive, given that after some small amount of time (eg half an hour), the OS stops responding? What are the recommended next steps?

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• How to optimize a postgreSQL server for a "write once, read many"-type infrastructure ?

  - by mhu

  Greetings, I am working on a piece of software that logs entries (and related tagging) in a PostgreSQL database for storage and retrieval. We never update any data once it has been inserted; we might remove it when the entry gets too old, but this is done at most once a day. Stored entries can be retrieved by users. The insertion of new entries can happen rather fast and regularly, thus the database will commonly hold several millions elements. The tables used are pretty simple : one table for ids, raw content and insertion date; and one table storing tags and their values associated to an id. User search mostly concern tags values, so SELECTs usually consist of JOIN queries on ids on the two tables. To sum it up : 2 tables Lots of INSERT no UPDATE some DELETE, once a day at most some user-generated SELECT with JOIN huge data set What would an optimal server configuration (software and hardware, I assume for example that RAID10 could help) be for my PostgreSQL server, given these requirements ? By optimal, I mean one that allows SELECT queries taking a reasonably little amount of time. I can provide more information about the current setup (like tables, indexes ...) if needed.

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• USB Device Not Recognized (Mac)

  - by Nargis

  Fortunately, my Mac-pro also made one of my USB storage devices inoperable. My data loss in that USB device but such as another USB device and USB keyboard are unaffected. I have heard that my friend usually trigger this problem by having at least two devices plugged in - typically thumb drives/USB flash drives, and then once a second flash drive is plugged in that become unrecognized. I have only two USB ports and first I think port loose when I connect two USB devices. But later I found these hidden files (“.Spotlight-V100”, “.TemporaryItems”, “.Trashes”, and “._.Trashes”) are created by Mac OS. And before unrecognized that USB device I have deleted these files and my friend had also done the same action. Now I don’t want to test for next USB device to become unrecognized and I won’t deleted any hidden system file inside the flash drives. But I really want to know why these problems happened. Can I delete these hidden files when I only connect to virtual machine (Vista), because I used to delete all useless hidden files from USB flash drives? Any suggestions or thoughts to prevent this or alternative suggestions to fix the problem that take lossless would be much appreciated.

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• WD Caviar Green Extremely Slow

  - by Steven

  I am encountering a really weird problem on my WD Caviar Green HDD. Well first of all I have 2 HDDs on my Desktop, one 160GB Seagate holding my Win7 Ultimate x64 and the problematic one, WD 1.5 Caviar Green for storage purpose. My problem is kinda weird, when I transfer files from my Seagate(C:) to my WD (D:) the speed is good (50-60MB/s). Then the problem arises when I transfer too "many" large files, the transfer speed would go straight down to kilobytes/s. Well after I cancelled the transfer and access my D:, even entering a folder requires loading for like 10 seconds. Such problem not only arises when I am transferring files to my D:, it seems like my WD can't handle much activities. For instance, last time I installed my game on D: and I would face much lag after playing for some time. When the same game is installed on C: no problem arises. Does anyone knows what is the problem? P/S: There was one temporary solution that I used to tried. After the "situation" occurs, I tried to access as many folders on D: as I can and let it load, repeating such actions and giving it some time bring the D: back to speedy transfer. However, large transfers would causes the situation to happen again. Does it have something to do with cache whatsoever?

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• Latitude D600 USB port problem

  - by Moab

  Both USB ports stopped communicating on my D600, they have power, my optical mouse still lights up, no device works on the ports, everything is fine in Device manager in Dual boot XP and W7. Checked the bios, not much in there for USB. No usb device shows up when I use the F12 boot device menu either, so it must be some hardware issue. I have another hard drive with Ubuntu on it, popped it in and USB does not communicate with it either. Appears to have 5v but no communication, any Ideas besides another motherboard or USB card for the pcmcia slot (these don't work to well from my research)? I mostly use them for mass storage devices and pcmcia slots don't supply enough power for these devices. Thanks to all who answer with last ditch efforts. I hate to give up on it, its been good to me and still runs rather well for its vintage. EDIT: I did inspect the ports with a flashlight and did a partial disassembly of the laptop in an attempt to check the solder joints, but would require complete motherboard removal to see them, that is where I stopped. .

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• How to install Red Hat Enterprise Linux on Apple Macbook Pro MacBookPro4,1

  - by Todd V. Rovito

  I have a one year old Mac Book Pro that I am trying to get RHEL 5.4 installed on via bootcamp. No matter what I do I can't get the installer to boot. I have tried multiple DVD's and even verified the install works on a new Mac Book Pro. Most of the time the installer simply locks up. I usually use Linux text with all-generic-ide on the boot line. I removed the ide parameter and I just used linux text. The results I get are that a bunch of kernel messages appear then the background turns blue and a thin text box pops up saying its loading ata..... something it disappears too fast for me to read. Then the machine freezes. I pressed the alt function keys to see if I could look at the system log, here is what it says: Alt-f3 says "trying to mount CD device hda" Alt-f4 says status error: hda: lastFailedSense Hda: Failed opcode was: unknown Hda: Lost interrupt Hda: Drive not ready for command Ide-cd: command 0x3 timed out Above this junk it looks like it found the partition because it knew it was 20 GB and listed as /dev/sda3. I think it has something to do with the CD drive, is that possible? Thanks again for the support. PS I posted in the apple support forums ( Apple.com Support Discussions Boot Camp Installation and Storage) and didn't get an answer.

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• Azure Virtual Machines - what fault tolerance do they provide?

  - by Borek

  We are thinking about moving our virtual machines (Hyper-V VHDs) to Windows Azure but I haven't found much about what kind of fault tolerance that infrastructure provides. When I run VHD in Azure, I've got two questions: Is my VHD and all the data in it safe? I think that uploaded VHDs use the "Storage" infrastructure so they should be automatically replicated to multiple disks and geographically distributed but should I still make a full-image backup just to be safe? (Note that of course I will be backing up the actual data inside VMs that I care about; I just want to know if there is a chance greater than 0.0000001% that one day I will receive an email from Microsoft telling me that my VM is gone and that I should create or restore it from scratch). Do I need to worry about other things regarding the availability of my VMs? I mean, when I have an on-premise server I need to worry about the hardware itself, about the host operating system, what would happen if my router failed, if my Hyper-V's C: drive failed etc. Am I right in thinking that with Azure, their infrastructure takes care of all of this? Thanks.

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• Compatibility of Fedora install on a Hybrid drive

  - by kjh

  I recently bought un ultrabook with a 500gb/32gb sdd hdd hybrid drive, and I'm having trouble replacing windows on it with fedora seventeen. it errors out saying there was an unhandled exception. Is linux compatible with hybrid drives? or can the operating system on a hybrid drive not be replaced? Edit: here are the steps I select special storage devices because it ignores my hard drives otherwise at this point i get the message: "Disk contains bios raid meta data, disk sda will be ignored" I can pick a hostname, select my timezone and set a password at the install type screen, no matter what I select (use all free space, replace linux systems, create custom partition etc..) once I click next, it says "an unhandled exception" has occured. and I can no longer proceed with installation. Here is the error message: anaconda 17.29 exception report Traceback (most recent call first); File "/usr/lib64/python2.7/size-packages/pyanaconda/bootloader.py"; line 183 self.stage1_drive=self_drives[0] File "/usr/lib64/python2.7/site-packages/pyanaconda/rw/cleardisks_gui.ph"; line... and tons of more lines like that

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• What is the max connections via remote desktop for a small server?

  - by Jay Wen

  I have a small server running MS Server 2012. The CPU is a Xeon E3-1230 V2 @ 3.30GHz, 4 Cores, 8 Logical Processors, 8 GB RAM. Main HD is a Samsung 840, and the big storage is a 4 disk WD Black Raid 10 Array in a Synology NAS enclusure. My question is: given this hardware, approximately how many users can the system support via "Remote Desktop Connection"? Assume there are no licensing limits. These are not admin users. I know there is a two admin limit. This boils down to: What resources does one remote connection require? RAM? % of the CPU? Networking bandwidth? I guess the base case would be for a conection where the user is inactive or simply browsing cnn. Once you know this, you know how many you could fit on the machine before something is maxed-out. In reality, users would be mostly on Excel (multi-MB spreadsheets). I know the approx. resources currently required by each copy of Excel.

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• Does having TRIM enabled affect other hard drives on a computer (and how do you know when Windows is using it)?

  - by Breakthrough

  I recently purchased a solid state drive (an OCZ Vertex 2 (80 GB)) to use as my primary operating system partition. I also have three other SATA hard drives of assorted sizes. I successfully installed Windows 7 Professional onto the SSD (works awesome, great response time and transfer rate), and used the other three HDDs for data storage. I was browsing through the Bible of OCZ SSDs, and noticed the following in Section 60-76 - Tweaks and TRIM: Q. How do I know if TRIM is enabled on my OCZ SSD? A. In Windows 7, go to start/run/cmd), type the following: fsutil.exe behaviour query DisableDeleteNotify It should respond back with: DisableDeleteNotify=0 if TRIM support is ready and active. If it's not, then type: fsutil.exe behavior set DisableDeleteNotify 0 After a bit of searching on Google, I found similar results elsewhere (set DisableDeleteNotify to 0, which makes sense since for TRIM to work, the solid-state drive needs to be notified when deletes occur (for the garbage collector) unlike a normal hard drive). When I run the query on fsutil, I get the following result: DisableDeleteNotify = 48 Following the instructions I found, I set this to 0 instead of 48. However, I am beginning to wonder. Is this all the proof I really need that the OS is using TRIM? Also, since this applies globally for the computer, is TRIM data being sent to the other hard drives connected to the computer? And if so, would this cause any degradation in disk performance?

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• Write once, read many (WORM) using Linux file system

  - by phil_ayres

  I have a requirement to write files to a Linux file system that can not be subsequently overwritten, appended to, updated in any way, or deleted. Not by a sudo-er, root, or anybody. I am attempting to meet the requirements of the financial services regulations for recordkeeping, FINRA 17A-4, which basically requires that electronic documents are written to WORM (write once, read many) devices. I would very much like to avoid having to use DVDs or expensive EMC Centera devices. Is there a Linux file system, or can SELinux support the requirement for files to be made complete immutable immediately (or at least soon) after write? Or is anybody aware of a way I could enforce this on an existing file system using Linux permissions, etc? I understand that I can set readonly permissions, and the immutable attribute. But of course I expect that a root user would be able to unset those. I considered storing data to small volumes that are unmounted and then remounted read-only, but then I think that root could still unmount and remount as writable again. I'm looking for any smart ideas, and worst case scenario I'm willing to do a little coding to 'enhance' an existing file system to provide this. Assuming there is a file system that is a good starting point. And put in place a carefully configured Linux server to act as this type of network storage device, doing nothing else. After all of that, encryption on the files would be useful too!

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• Would a PHP application benefit from being served from a RAM drive?

  - by Tom Marthenal

  I am in charge of hosting a PHP application that is large and slow, but easy to scale. The application is entirely static, with writable disk storage needed. We've profiled the application, and the main bottleneck appears to come from loading the application and not the work the application does. The application is not CPU-intensive, although it does use a fair amount of memory (think Magento). Currently we distribute it by having a series of servers with the same PHP files on their hard drive and a load balancer in front of them. Easy but expensive. I've been reading about RAM disks and the IO benefits they offer, and was wondering if they would be well-suited to PHP applications. Since PHP applications are loaded from disk for every request and often involve lots of different files (as opposed to being kept in memory like with a Java application), I would figure that disk performance can be a severe bottleneck. Would placing the PHP files on a RAM disk and using the mount point as Apache's document root offer performance benefits? A startup script could create the RAM drive and then copy the files (which are plain-text and small) from a permanent location to the temporary RAM drive. Does this make sense, or should I just trust the linux kernel to cache the appropriate files in memory by itself?

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• Per-mailbox IMAP settings in Exchange 2003 apply successfully but revert to server default

  - by erictheavg

  The title says most of it. I have a Spiceworks mailbox that connects to our Exchange Server 2003 box via IMAP for receiving help desk issues. But for complicated reasons, I want it to receive those emails in text-only format. So, I discovered that you can just go to: Exchange System Manager Administrative Groups First Administrative Group First Storage Group Mailbox Store Mailboxes Right-click the mailbox, Configure Exchange Features Edit the properties for IMAP Set that mailbox to only receive message bodies as plain text. I click OK, then Next, it reports success, and I assume I'm done. But then when I go right back to where I was, I see that "Use protocol defaults" is still checked. Anyone have a clue why this would be? Some other details: I'm logged in as Administrator when I do this. I can't change this setting for the entire IMAP virtual server because some regular users use it. I only have one IP address to play with, which means I can't create another IMAP virtual server. Any suggestions or ideas are greatly appreciated!

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• NFS on top of GFS2 - does it work?

  - by Matthew

  We're currently using a NoSQL derivative called Splunk to receive our data. The software supports something called "search head pooling" in which the job-dispatching engine is housed on several servers which share a common storage point. Originally our intention was to use a clustered filesystem like GFS2 because of low latency, stability, and ease of setup. We set up GFS2, and it's working with no issues. However when trying to run the software, it's trying to create lock files, and a bunch of other things that their support team can't quite explain. Ultimate feedback from them was that they only support NFS. Our network administration team heavily frowns on NFS (lack of stability, file lock issues, etc). So, I was thinking about the possibility of setting up NFS on each server in the cluster to act as a wedge layer between the GFS2 filesystem and the software. Basically configure each server to export the GFS2 filesystem's mountpoint via NFS, and then tell each server to connect to that NFS share. That way we aren't introducing any single-points-of-failure should a dedicated NFS server go down, but the vendor gets their "required" NFS share. I'm just brainstorming ways around, so please tear this apart :)

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• MysqlTunner and query_cache_size dilemma

  - by wbad

  On a busy mysql server MySQLTuner 1.2.0 always recommends to add query_cache_size no matter how I increase the value (I tried up to 512MB). On the other hand it warns that : Increasing the query_cache size over 128M may reduce performance Here are the last results: >> MySQLTuner 1.2.0 - Major Hayden <[email protected]> >> Bug reports, feature requests, and downloads at http://mysqltuner.com/ >> Run with '--help' for additional options and output filtering -------- General Statistics -------------------------------------------------- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.5.25-1~dotdeb.0-log [OK] Operating on 64-bit architecture -------- Storage Engine Statistics ------------------------------------------- [--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster [--] Data in InnoDB tables: 6G (Tables: 195) [--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 17) [!!] Total fragmented tables: 51 -------- Security Recommendations ------------------------------------------- [OK] All database users have passwords assigned -------- Performance Metrics ------------------------------------------------- [--] Up for: 1d 19h 17m 8s (254M q [1K qps], 5M conn, TX: 139B, RX: 32B) [--] Reads / Writes: 89% / 11% [--] Total buffers: 24.2G global + 92.2M per thread (1200 max threads) [!!] Maximum possible memory usage: 132.2G (139% of installed RAM) [OK] Slow queries: 0% (2K/254M) [OK] Highest usage of available connections: 32% (391/1200) [OK] Key buffer size / total MyISAM indexes: 128.0M/92.0K [OK] Key buffer hit rate: 100.0% (8B cached / 0 reads) [OK] Query cache efficiency: 79.9% (181M cached / 226M selects) [!!] Query cache prunes per day: 1033203 [OK] Sorts requiring temporary tables: 0% (341 temp sorts / 4M sorts) [OK] Temporary tables created on disk: 14% (760K on disk / 5M total) [OK] Thread cache hit rate: 99% (676 created / 5M connections) [OK] Table cache hit rate: 22% (1K open / 8K opened) [OK] Open file limit used: 0% (49/13K) [OK] Table locks acquired immediately: 99% (64M immediate / 64M locks) [OK] InnoDB data size / buffer pool: 6.1G/19.5G -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance Reduce your overall MySQL memory footprint for system stability Increasing the query_cache size over 128M may reduce performance Variables to adjust: *** MySQL's maximum memory usage is dangerously high *** *** Add RAM before increasing MySQL buffer variables *** query_cache_size (> 192M) [see warning above] The server has 76GB ram and dual E5-2650. The load is usually below 2. I appreciate your hints to interpret the recommendation and optimize the database configs.

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• Something like Dropbox for local use

  - by Casper

  I am looking for a solution to sync folder pairs between a NAS and multiple local macs. Each of the macs could edit files and the other macs should then get synced automatically. Basically my own local version of Dropbox without using "cloud-storage". I have looked into solutions using rsync. As I understand it rsync is not really capable of doing a bi-directional sync. I also do not want to necessarily invoke the sync process. I would prefer a daemon running in the background - waiting and checking for changes and then syncing them "live". The program should also be flexible enough to recognize that it sometimes (in the case with laptops) can not reach the NAS. It should then just wait for the connection to be back again, without bugging me ever few minutes. I have looked into synk, folderwatch, rsync and a few others, but I haven't really found a solution. Isn't there something like "offline folders" from microsoft for the mac? Thanks PS: just for clarification - I don't want to sync for backup purposes, instead I am wanting to sync so that all macs have a local copy of the most recent changes to files.

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