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  • Can I enable discards on a LUKS-encrypted ssd drive in RHEL6 (and do I need to)?

    - by Dan Nestor
    I have a RHEL 6.4 workstation, running on a LUKS-encrypted LV residing on a SSD. I found RedHat documentation stating that dm_crypt does not currently support TRIM passthrough, however I also found other sources that state the opposite (albeit for other distributions) and even that discards are not needed for recent SSD drives which use some sort of automatic garbage collection. So: 1) Can I enable TRIM/discards with my setup? 2) Do I need to, for optimal disk performance? Thanks for your thoughts.

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  • ASA and cisco vs NSA sonic firewall

    - by Lbaker101
    Currently I’m trying to structure our network to fully support and be redundant with BGP/Multi homing. Our current company size is 40 employees but the major part of that is our Development department. We are a software company and continued connection to the internet is a requirement as 90% of work stops when the net goes down. The only thing hosted on site (that needs to remain up) is our exchange server. Right now i'm faced with 2 different directions and was wondering if I could get your opinions on this. We will have 2 ISPs that are both 20meg up/down and dedicated fiber (so 40megs combined). This is handed off as an Ethernet cable into our server room. ISP#1 first digital ISP#2 CenturyLink we currently have 2x ASA5505s but the 2nd one is not in use. It was there to be a failover and it just needs the security+ license to be matched with the primary device. But this depends on the network structure. I have been looking into the hardware that would be required to be fully redundant and I found that we will either of the following. 2x Cisco 2921+ series routers with failover licenses. They will go in front of the ASAs and either connects in a failover state or 1 ISP into each of the 2921 series routers and then 1 line into each of the ASAs (thus all 4 hardware components will be used actively). So 2x Cisco 2921+ series routers 2x Cisco ASA5505 firewalls The other route 2x SonicWalls NSA2400MX series. 1 primary and the secondary will be in a failover state. This will remove the ASAs from the network and be about 2k cheaper than the cisco route. This also brings down the points of failure because it’s just the 2x sonicwalls It will also allow us to scale all the way up to 200-400 users (depending on their configuration). This also makes so the Sonic walls. So the real question is with the added functionality ect of the sonicwall is there a point in paying so much more to stay the cisco route? Thanks!

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  • Allow users to view Word documents only and not be able to edit, copy or save them.

    - by Alexander
    Hello In a traditional Windows Server 2003 environment with AD, we have shared a folder for our policy documents (MS Word). These documents get edited/updated now and then by the administrator(principal of college). Users only have read-only access to the folder, but they can still save-as and then change the content. Sharepoint is a possible solution but not easy to implement. We also thought of using a CMS on Linux and installing Joomla to let users only view the docs with a document management system... but is it possible to automatically retrieve the policy folder on the network and convert or put it in a format that users can only view and not copy? We also thought of saving the docs to secure pdf format but the principal wants an automated system. Basically she just wants to work in Word and the policies must be available to staff members on the network. Any ideas? Much appreciated.

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  • Raid1 with active and spare partition

    - by Daniel Baron
    I am having the following problem with a RAID1 software raid partition on my Ubuntu system (10.04 LTS, 2.6.32-24-server in case it matters). One of my disks (sdb5) reported I/O errors and was therefore marked faulty in the array. The array was then degraded with one active device. Hence, I replaced the harddisk, cloned the partition table and added all new partitions to my raid arrays. After syncing all partitions ended up fine, having 2 active devices - except one of them. The partition which reported the faulty disk before, however, did not include the new partition as an active device but as a spare disk: md3 : active raid1 sdb5[2] sda5[1] 4881344 blocks [2/1] [_U] A detailed look reveals: root@server:~# mdadm --detail /dev/md3 [...] Number Major Minor RaidDevice State 2 8 21 0 spare rebuilding /dev/sdb5 1 8 5 1 active sync /dev/sda5 So here is the question: How do I tell my raid to turn the spare disk into an active one? And why has it been added as a spare device? Recreating or reassembling the array is not an option, because it is my root partition. And I can not find any hints to that subject in the Software Raid HOWTO. Any help would be appreciated. Current Solution I found a solution to my problem, but I am not sure that this is the actual way to do it. Having a closer look at my raid I found that sdb5 was always listed as a spare device: mdadm --examine /dev/sdb5 [...] Number Major Minor RaidDevice State this 2 8 21 2 spare /dev/sdb5 0 0 0 0 0 removed 1 1 8 5 1 active sync /dev/sda5 2 2 8 21 2 spare /dev/sdb5 so readding the device sdb5 to the array md3 always ended up in adding the device as a spare. Finally I just recreated the array mdadm --create /dev/md3 --level=1 -n2 -x0 /dev/sda5 /dev/sdb5 which worked. But the question remains open for me: Is there a better way to manipulate the summaries in the superblock and to tell the array to turn sdb5 from a spare disk to an active disk? I am still curious for an answer.

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  • Migrate Thunderbird 3 Saved Searches Between Accounts

    - by UltraNurd
    Long story short, the sysadmins have moved me to a new mailserver. In the process, they needed to create a separate account in Thunderbird and disable my old account. They took care of all of the mail migration. However, my saved search folders didn't go along for the ride. I have over 20 complex searches that I'd rather not have to reenter manually by hand. You can't drag saved searches between accounts like other folders. I tried closing Thunderbird, doing a find/replace in virtualFolders.dat in my Thunderbird profile folder, saving that file, and reopening Thunderbird, but that didn't appear to do anything. I'm assuming the search folders are also saved in one of the sqlite databases... does anyone know where to look?

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  • Keep lan connection alive while going to sleep

    - by user18151
    Is it possible to keep lan connection alive when going to sleep? Although I would like a laptop independent(in general) answer, my laptop is Thinkpad T500 and the power manager shows in PCI options, the following three option regarding saving link state power: Off, moderate, maximum. Also instant resume apparently does something different, so that isn't much help either. I'm on Windows-7. Here's why: I'm a student, and currently I keep my laptop on almost all the time, but sometimes I sleep it and then I require to check something, so I turn it on. But then internet starts in at least a minute. So I avoid even putting it to sleep. I want that the internet connection should persist, so that I can put it to sleep to avoid power consumption.

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  • Determining End of Line Delimiter

    - by Michael Merchant
    How do you verify what the delimiter for a file is? I'm using eclipse to edit a script file on my windows system that I use to deploy on my unix server. The script specifies file names and I'd like to be certain that eclipse is saving the files with unix end of line delimiters. I've set my preferences to use the Unix Line Delimiter on new files using: Window > Preferences > General > Workspace > "New text file line delimiter" And have changed my script file's line delimiter using. File -> Convert Line Delimiters To Is there a way (preferably with the eclipse IDE) to check that there is no "\r"?

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  • SMTP Server: '421 unable to verify sender domain'

    - by Tim
    I have recently setup a new SMTP server on my new webserver (win 2008). The server sends mail from a number of domains hosted on the website, everything seems to work OK but I am getting a number of undeliverable reports which state '421 unable to verify sender domain' What does this mean and what should I do about it?

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  • Hot-swap drive got new name, can I change it on-the-fly?

    - by T.J. Crowder
    One of the HDDs in my server's RAID config failed, so I took it out of the array and had the data center hot-swap it. They've done that, but now the new drive is /dev/sdc rather than /dev/sda. I suspect — correct me if I'm wrong — that if I reboot the server, it will be /dev/sda again, so I'm hesitant to add it back to the array as /dev/sdc because I don't want to lay a trap for myself to fall into on the next reboot. I'd just as soon not reboot the server if I don't need to (if I do need to, well, too bad for me). Is there a way I can change the device name from /dev/sdc to /dev/sda without rebooting? This is on Ubuntu 10.04 LTS. It's an md array ("Linux Software RAID"), where currently one of the devices (there are a couple of them) looks like this ("degraded" because I've removed the old /dev/sda from it): # mdadm --detail /dev/md0 /dev/md0: Version : 00.90.03 Creation Time : Sun Oct 11 21:07:54 2009 Raid Level : raid1 Array Size : 97536 (95.27 MiB 99.88 MB) Used Dev Size : 97536 (95.27 MiB 99.88 MB) Raid Devices : 2 Total Devices : 1 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Thu Jun 30 09:31:16 2011 State : clean, degraded Active Devices : 1 Working Devices : 1 Failed Devices : 0 Spare Devices : 0 UUID : 496be7a5:ab9177ed:7792c71e:7dc17aa4 Events : 0.112 Number Major Minor RaidDevice State 0 8 17 0 active sync /dev/sdb1 1 0 0 1 removed Thanks, Update: Reading through the kernel md documentation, I suspect that if the name changes on reboot, it won't matter. (Good design, that.) Here's why: Boot time autodetection of RAID arrays When md is compiled into the kernel (not as module), partitions of type 0xfd are scanned and automatically assembled into RAID arrays. This autodetection may be suppressed with the kernel parameter "raid=noautodetect". As of kernel 2.6.9, only drives with a type 0 superblock can be autodetected and run at boot time. The kernel parameter "raid=partitionable" (or "raid=part") means that all auto-detected arrays are assembled as partitionable. I do have md compiled into the kernel, so I'm rebuilding the array now and will do the reboot to see what happens. Even if it works, the above doesn't answer the question I actually asked, so unless someone comes along and answers that question in the meantime (I'd be interested, even if it's not necessary for what I'm doing this very moment), I'll just delete the question to keep noise down.

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  • Monitor total service uptime using Icinga

    - by dhh
    I am using Icinga (Nagios fork) for monitoring ~10 webservers, each one providing different services. I would now like to provide an aggregated view on the server states on our companies intranet, providing information like: server | state | last downtime | Ø uptime (month) | Ø uptime (year) Srv1 | OK | 2013-10-09 | 99,5% | 99,8 % Srv2 | ERROR | 2013-10-31 | 73,1% | 85,4 % Is there a possibility to get those values from icinga?

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  • Monitor a log file on Linux and send each line to another program

    - by mlambie
    I run an apt-cacher-ng server on Ubuntu Linux which writes logs in the following format: 1299745593|O|149406|XXX.XXX.XXX.XXX|uburep/pool/main/t/tiff/libtiff4_3.9.2-2ubuntu0.4_amd64.deb 1299745593|O|10154976|XXX.XXX.XXX.XXX|uburep/pool/main/l/linux-firmware/linux-firmware_1.34.4_all.deb 1299748529|O|39368|XXX.XXX.XXX.XXX|uburep/pool/main/n/nagios-nrpe/nagios-nrpe-server_2.12-4ubuntu1_amd64.deb 1300155440|O|680100|XXX.XXX.XXX.XXX|uburep/pool/main/t/tzdata/tzdata_2011c-0ubuntu0.10.04_all.deb It shows the timestamp, direction (in or out), byte count, IP and filename. Every time a line is written to it, I'd like to also send that line to another program. I will have this program insert the line into a database so that I can crunch some statistics about how much bandwidth we're saving through operating a caching server. I do not want to cat the log file every X minutes (via cron) looking for new entries as it'd be somewhat computationally uneconomical. Instead I'd prefer to have a daemon monitor the log, and when a change is detected, each line is sent to my database-insertion script. Will swatch achieve this, or are there better options?

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  • What tools can be used to download all images in a webpage?

    - by bobo
    I would like to download all images in a web page. The tool should be smart enough to examine the css and javascript files in the page source to look for the images. Ideally, it should also replicate the folder hierarchy, saving the images in the correct folder. For example, the web page may have some images for menu items stored in images/menu/ and for background images it may be stored in images/bg/. Is there such a tool that you know of? (preferably in Windows but Linux is still ok) Many thanks to you all.

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  • Celery - minimize memory consuption

    - by Andrew
    We have ~300 celeryd processes running under Ubuntu 10.4 64-bit , in idle every process takes ~19mb RES, ~174mb VIRT, thus - it's around 6GB of RAM in idle for all processes. In active state - process takes up to 100mb of RES and ~300mb VIRT Every process uses minidom(xml files are < 500kb, simple structure) and urllib. Quetions is - how can we decrease RAM consuption - at least for idle workers, probably some celery or python options may help? How to determine which part takes most of memory?

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  • Why does my screen dim on a desktop installation of Windows 7?

    - by Robert Cartaino
    Periodically, while using my Windows 7 Pro desktop installation, the screen suddenly dims. The brightness is about 75% normal (estimate). It's as if I am in a power-saving mode on a laptop running on batteries. But this is a full desktop installation. I know it is not a hardware glitch or monitor adjustment issue because the Windows cursor is still bright white while everything else goes dim. The Control Panel Power Options have not been changed. They are set to "Balanced [active]" and I have tried restoring the default settings. Flipping through the power and display settings, everything looks "normal." There is no screen saver or power-off-after settings apparent. Rebooting the system resets everything to full brightness but I can't find a way to restore it in Windows or to keep it from happening in the first place. Suggestions?

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  • Best practice on Linux servers and CPU/power throttling?

    - by Valentin
    I am running a couple of Debian 6 (2.6.32) and 7 (3.2) Linux servers and all of them have energy saving settings enabled in their BIOS. Furthermore Linux shows that the CPUs are throttled if the servers are idling. I wonder if this could cause any harm - could there be e.g. performance impacts because Linux would not be able to handle throttling correctly? Is there a best practice for Linux servers and power/CPU throttling? Do you guys switch your energy profiles to "performance" or do you leave both the BIOS and the OS with their default settings? The reason I am asking is that I encountered several performance issues on physical Dell servers although all values (CPU/load, memory, I/O, network etc.) seemed to be normal. After changing the BIOS power settings to "performance" in those specific cases, I was able to get rid of the performance issues.

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  • MegaCli newly created disk doesn't appear under /dev/sdX

    - by Henry-Nicolas Tourneur
    After having successfully added 2 new disks in a new RAID virtual drive (background initialization done), I would have exepected it to appear under /dev/sdh but it's not there (so, unusable). The system is running a CentOS 5.2 64 bits, HAL and udev daemons are running, not records of any sdh apparition under the messsage log file or in dmesg, only MegaCli do see that virtual drive. Any idea ? Some data: [root@server ~]# ./MegaCli -LDInfo -LALL -a0 Adapter 0 -- Virtual Drive Information: Virtual Disk: 0 (target id: 0) Name: RAID Level: Primary-1, Secondary-0, RAID Level Qualifier-0 Size:139392MB State: Optimal Stripe Size: 64kB Number Of Drives:2 Span Depth:1 Default Cache Policy: WriteBack, ReadAheadNone, Direct, No Write Cache if Bad BBU Current Cache Policy: WriteBack, ReadAheadNone, Direct, No Write Cache if Bad BBU Access Policy: Read/Write Disk Cache Policy: Disk's Default Virtual Disk: 1 (target id: 1) Name: RAID Level: Primary-1, Secondary-0, RAID Level Qualifier-0 Size:285568MB State: Optimal Stripe Size: 64kB Number Of Drives:2 Span Depth:1 Default Cache Policy: WriteBack, ReadAheadNone, Direct, No Write Cache if Bad BBU Current Cache Policy: WriteBack, ReadAheadNone, Direct, No Write Cache if Bad BBU Access Policy: Read/Write Disk Cache Policy: Disk's Default [root@server ~]# ls -l /dev/disk/by-id/scsi-360* lrwxrwxrwx 1 root root 9 Nov 17 2010 /dev/disk/by-id/scsi-36001ec90f82fe100108ca0a704098d09 -> ../../sda lrwxrwxrwx 1 root root 10 Nov 17 2010 /dev/disk/by-id/scsi-36001ec90f82fe100108ca0a704098d09-part1 -> ../../sda1 lrwxrwxrwx 1 root root 10 Nov 17 2010 /dev/disk/by-id/scsi-36001ec90f82fe100108ca0a704098d09-part2 -> ../../sda2 lrwxrwxrwx 1 root root 9 Nov 17 2010 /dev/disk/by-id/scsi-36090a028e0fe07e78f94940c0000a0ee -> ../../sdf lrwxrwxrwx 1 root root 10 Nov 17 2010 /dev/disk/by-id/scsi-36090a028e0fe07e78f94940c0000a0ee-part1 -> ../../sdf1 lrwxrwxrwx 1 root root 9 Nov 17 2010 /dev/disk/by-id/scsi-36090a028e0fe972a3f91240a0000005f -> ../../sdb lrwxrwxrwx 1 root root 10 Nov 17 2010 /dev/disk/by-id/scsi-36090a028e0fe972a3f91240a0000005f-part1 -> ../../sdb1 lrwxrwxrwx 1 root root 9 Nov 17 2010 /dev/disk/by-id/scsi-36090a028e0fea7e18f94640c000020ec -> ../../sde lrwxrwxrwx 1 root root 10 Nov 17 2010 /dev/disk/by-id/scsi-36090a028e0fea7e18f94640c000020ec-part1 -> ../../sde1 lrwxrwxrwx 1 root root 9 Nov 17 2010 /dev/disk/by-id/scsi-36090a028e0feb7da8f94340c0000203d -> ../../sdd lrwxrwxrwx 1 root root 10 Nov 17 2010 /dev/disk/by-id/scsi-36090a028e0feb7da8f94340c0000203d-part1 -> ../../sdd1 lrwxrwxrwx 1 root root 9 Nov 17 2010 /dev/disk/by-id/scsi-36090a028e0fed7d78f94040c000080b7 -> ../../sdc lrwxrwxrwx 1 root root 10 Nov 17 2010 /dev/disk/by-id/scsi-36090a028e0fed7d78f94040c000080b7-part1 -> ../../sdc1 lrwxrwxrwx 1 root root 9 Nov 17 2010 /dev/disk/by-id/scsi-36090a05830145e58e0b9c479000010a1 -> ../../sdg lrwxrwxrwx 1 root root 10 Nov 17 2010 /dev/disk/by-id/scsi-36090a05830145e58e0b9c479000010a1-part1 -> ../../sdg1

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  • SQL Server: how to check securables

    - by jrara
    I would like to make a t-sql query to check which logins have 'view server state' permission in server type securables. How to achieve this? This query from mssqltips don't show this: http://www.mssqltips.com/tip.asp?tip=1718 SELECT prin.[name] [User], sec.state_desc + ' ' + sec.permission_name [Permission] FROM [sys].[database_permissions] sec JOIN [sys].[database_principals] prin ON sec.[grantee_principal_id] = prin.[principal_id] WHERE sec.class = 0 ORDER BY [User], [Permission];

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  • Opsview Notifications, how to report event duration

    - by dotwaffle
    At present, Opsview reports recoveries in the following format: RECOVERY: Internal Alarm is OK on host Ellie: SNMP OK - 0 Service: Internal Alarm Host: Ellie Alias: Ellie Address: 1.2.3.4 State: OK Comment: () Date/Time: Mon Oct 5 14:57:53 BST 2009 Additional Info: SNMP OK - 0 What I would ideally like to do is add a "duration" field, so that you can tell without scrolling back on a Blackberry how long the event has been at fault for. Is there an easy solution to this?

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  • Home server - HP Proliant Microserver - Software and setup - OS on USB stick? [closed]

    - by Lloyd Watkin
    I've just purchased a HP ProLiant Microserver for home use. I want to set up with web server, samba shares, the usual stuff. My question is really about system setup. It has an internal USB socket so I've attempted to install a copy of Fedora 14 onto it. I turned off X/Gnome, but it still ran like a pig. I've now put the OS on one of the internal disks (250Gb, 7200rpm), but I was wondering if there was a way to utilise the internal USB to give me better power-saving allowing the hard drives to be shut down when not in use. How would you set this server up? I'd rather not go to the extra cost of an SSD right now, but if that's the best way then so be it.

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  • Any way to disable specific CPU sleep modes?

    - by Philippe
    I just got a new Toshiba Tecra S11 notebook, which has a Core i5 520M CPU, and it appears to suffer from a well-known problem: a high pitched noise when the CPU is idle. Googling around revealed that this is caused by a specific power-saving mode in the CPU. In most cases, C4 mode is blamed for the noise. So my question is: is it possible to disable C4 mode (or any other "sleep" mode) using some utility or BIOS setting? I don't mind if it hurts battery life. I'd appreciate any advice on this matter. It's driving me crazy.

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  • Create kickstart configuration file from existing configuration.

    - by ÜMineiro
    Is there a script or another way to automatically generate a kickstart configuration file from the system state of an existing server so that the file can be use to replicate (not clone) the configuration of the system in another install? I know that the anaconda-ks.cfg file is stored on the /root dir. but the system in question have been extensively changed since it's installation, and the file is of no use now.

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  • how to change interface ip in ifconfig with /etc/network/interfaces

    - by user2478348
    Hi everybody when modifiying /etc/network/interfaces, saving it and then executing ifconfig i can't see the modification i made..for example here is part of my /etc/network/interfaces: auto wlan1 iface wlan1 inet static address 192.168.0.60 netmask 255.255.255.0 gateway 192.168.0.61 you can see that the IP address of my wlan1 is 192.168.0.60 but when typing ifconfig i have this: wlan1 Link encap:Ethernet HWaddr 00:19:70:0f:c2:9c inet adr:192.168.0.1 Bcast:192.168.0.255 Masque:255.255.255.0 adr inet6: fe80::219:70ff:fe0f:c29c/64 Scope:Lien UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Packets reçus:758 erreurs:0 :0 overruns:0 frame:0 TX packets:610 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 lg file transmission:1000 Octets reçus:73490 (73.4 KB) Octets transmis:127883 (127.8 KB) (the inet adr:192.168.0.1 and not 198.168.0.60)..if someone can help me I'll be very thankful :)

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