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• Is there a realiable way to troubleshoot wake up from sleep in Windows?

  - by Borek

  Is there a reliable way to troubleshoot laptop wakes? I've seen "heuristics" posted here and there but isn't there really a simple and deterministic way to tell what's causing a problem? Specifically, my laptop wakes up about every hour for about 2 minutes. Exported event log entries are here: http://www.mediafire.com/?abcqb00v5wyo6pj. I've tried: powercfg -devicequery wake_armed Empty result set. Scheduled tasks - the main ones are not scheduled to run every hour. When go through a long list of all possible tasks, there are some that are set to be triggered every hour (e.g., MS "RacTask" whatever it is). But when I go to power options, Advanced settings, Sleep, Allow wake timers it is set to "Disable". Also, the specific task is not set to wake the computer if necessary. Power options for my Ethernet card don't enable it to wake the computer - the cable is disconnected anyway. There are no other HW devices attached - no USB disks, no keyboards / mice etc. I am really clueless and quite unhappy that it's so hard to troubleshoot this situation.

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• Time Machine vs Source Control?

  - by Blub

  Finally got convinced to start using some kind of version control for my code instead of zipping down a copy of the project at the end of each day. Downloaded Tortoise SVN and used it to create a repository localy on my hdd. I've been using it for 2 days now but I have to say that using it is actually more hassle than just copying the project manually in explorer. Sure, you only store incremental changes but with the cheap disks of today I can't really say that's an argument when you only have small projects. I haven't realy found a quick way to browse the older versions of my files eighter. What I want is an infinite undo that is completely transparent while I code, if I save the file I want a backup. I don't want to check out, check in and don't even get me started on moving files. I haven't tried Time Machine for OS X but it looks like it's exactly what I'm looking for. Does such a program exist for windows? Preferably free and with some kind of tagging-system so I can tag a timestamp when the project is working etc. Maybe should add that I mostly work alone on a single computer. Update: Some of you asked why I want backup. Since I work alone it's mostly to allow me to quickly hack up a solution without worrying that something will screw up.

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• Routing Essentials

  - by zharvey

  I'm a programmer trying to fill a big hole in my understanding of networking basics. I've been reading a good book (Networking Bible by Sosinki) but I have been finding that there is a lot of "assumed" information contained, where terms/concepts are thrown at the reader without a proper introduction to them. I understand that a "route" is a path through a network. But I am struggling with visualizing some routing-based concepts. Namely: How do routes actually manifest themselves in the hardware? Are they just a list of IP addresses that get computed at the network layer, and then executed by the transport? What kind of data exists in a so-caleld routing table? Is a routing-table just the mechanism for holding these lists of IP address (read above)? What are the performance pros/cons for having a static route, as opposed to a dynamic route?

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• How To Replace Laptop HDD Without Losing Data?

  - by Ishan

  Hello, I recently went to Dell Service center and they tell that HDD is faulty and needs to be replaced. I have a Studio 1457 laptop with 500 GB HDD and don't want to lose the data(purchased in May 2010, still under warranty). I have searched a bit and I think it may be best to use a disk imaging software for this task. However, I don't know about a good software. I have following steps in mind: Get a 1 TB External HDD. Make an image of existing 500 GB HDD and store data on external disk. Install new HDD and install a brand new Windows copy and then install the software on it. Using the same software I used to make image, restore the old HDD image on new one. However, I have some questions in mind. First, is this possible? Second, I live in a country where piracy is a big issue and I am sure the support executive who will come to change HDD will have a pirated copy. But I have genuine Windows 7 Pro and don't want to lose it. Now, Dell does not supply and OS disks, so I can't install it on new HDD! If I follow above steps, which version of Windows 7 will be retained? One in the image(authentic) or one in the new HDD(pirated). I am ready to purchase a good software for this task and my budget is $50-60. Since laptop is under warranty, new HDD will be free. One last thing, I have created a Windows Migration file whose size is 70 GB. Can it be used to move from Windows 7 Pro to Windows 7 Pro?(In case I get a genuine copy of Windows 7!) Any other method to save all the data? Thanks in advance.

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• Aging SBS needs updates / Thoughts for one-off, off-line complete backup?

  - by tcv

  Hey guys, So, we checked out the status of an SBS 2003 at one of our more recent, spend-averse clients and found it to be woefully out-of-date. Scary out of date. I think it's running IE2. Ok, maybe not that far back. Anyway, I was thinking that I could use some kind of disk-imaging software to image the four IDE drives within and, in the event the server gets some kind of Update Induced Indigestion, I could completely restore. Usually my go-to software for this is Acronis, but my client will likely balk at a $500 price tag for a one-off backup with their server product. I had thought we could use the boot media from, say, Backup & Recovery 10 to take an off-line image of all the drives. According to their CHAT tech support, however, it will not work. I pressed for the technical reasons and they said they'd email me. They haven't emailed me. They still might. This server is running SBS 2003, pre sp2. It's got four IDE disks. One is a Basic disk, which contains the O/S. The others are bound as a dynamic disk. You might ask: "Don't they already have backup software?" They do! Backup Exec, a very low-end version that won't even do VSS. I don't know much about BE, but it seems to me that if the worst were to happen, it would mean building a new server O/S, installing BE (if the media is available), then restoring. Would it even work? I can take the system down for hours to do a backup and my goal here is a pretty dead-simple restore if the worst happens. Any and all suggestions are exciting. m

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• My D-Link Router is only allowing one connection

  - by Blaze

  My Router (Model: DI-624) is only allowing one wireless connection to one laptop. The other laptop is stuck hanging at connecting to the Internet I have the SSID set as "Pedro-Home" and is using a WPA PSK secured password. I have set the router using "Blaze-PC" while wired. Both Laptops critically need the Internet. > Dynamic DHCP Client List > > Host Name IP Address MAC > Address Expired Time > Blaze-PC 192.168.0.100 70-f1-a1-ff-39-a8 Apr/21/2011 17:49:14 > pedro 192.168.0.105 00-26-82-c8-47-25 Apr/21/2011 17:50:05 <<This computer isn't connecting.

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• Word 2007 "Out of Memory or Disk Space" Error on launch.

  - by Adam

  Word 2007 is installed on a Vista Home Premium machine and whenever it starts up it opens what appears to be a dynamic installer to do something and then throws up the "Out of Memory or Disk Space" error. Word 2007 never completes starting up. Reinstalling Word hasn't helped and if I can avoid reinstalling Windows until Windows 7 is released and get Word working in the mean time, that would be ideal. I've been looking around for a solution, once of which seemed to point to a problem with the user account. I created a second user on the machine and Word still had the same problem. The other solution that seems possible is a corrupted normal.dot/normal.dotm file. However, even in the location it should be, I can't seem to find it. Am I going in the right direction with this? Is there another solution I haven't come across that will fix this? If it is possible that renaming normal.dot/normal.dotm how can I find it?

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• Recovering a mdadm+lvm+ext4 partition with read error

  - by bitwelder

  One of disks in my NAS has failed. The NAS is running Linux, and it uses mdadm + LVM technology for its filesystems. I do have backup for most of the contents, but not for the very last changes, and if possible, I'd like to recover that from this failing disk. The disk (a 'green drive' WD10EARS 1TB in size) throws this kind of errors: Oct 3 12:00:41 kernel: [ 3625.620000] ata5.00: read unc at 9453282 Oct 3 12:00:41 kernel: [ 3625.620000] lba 9453282 start 9453280 end 1953511007 Oct 3 12:00:41 kernel: [ 3625.620000] sde5 auto_remap 0 Oct 3 12:00:41 kernel: [ 3625.630000] ata5.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 Oct 3 12:00:41 kernel: [ 3625.630000] ata5.00: edma_err_cause=00000084 pp_flags=00000003, dev error, EDMA self-disable Oct 3 12:00:41 kernel: [ 3625.640000] ata5.00: failed command: READ FPDMA QUEUED Oct 3 12:00:41 kernel: [ 3625.650000] ata5.00: cmd 60/40:00:e0:3e:90/00:00:00:00:00/40 tag 0 ncq 32768 in Oct 3 12:00:41 kernel: [ 3625.650000] res 41/40:00:e2:3e:90/12:00:00:00:00/40 Emask 0x409 (media error) <F> Oct 3 12:00:41 kernel: [ 3625.660000] ata5.00: status: { DRDY ERR } However, while testing with 'dd', I noticed that if I skip the first 4kB, the read seems to be ok, i.e. a command like. dd if=/dev/sde5 of=dev/null bs=4k count=1000 skip=1 doesn't return any read error. Supposing that there is no other read failure in the rest of the disk, would I be able to recover this 900 GB partition (as I mentioned before, it's a 'linux raid autodetect' partition, that contains a a LVM2 volume that contains a ext4 filesystem) if I copy-clone the partition somewhere else, but the first 4kB?

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• diskmgmt.msc: Cannot delete volume from USB

  - by Notinlist

  I have an USB drive with about 8GB of size. It has a single partition of size 169MB. Don't know why, I got it that way. I wanted to delete this small (FAT32) partition and create a single NTFS volume on it. First, I noticed that the "Delete volumme" option is disabled (grayed out). I then tried "Change drive letter and paths..." and removed "F:", that way I made sure that there are no open files on it. The "Delete volume" was still disabled. Then I got suspicious, and right clicked on the "Unallocated" area and I noticed that I did not have any useful option. All "New * volume" items are disabled. I exited from diskmgmt.msc, ran a cmd.exe with administrator privileges, ran the diskmgmt.msc from it, same experiences. Why can't i do anything with this disk? I've read some advices about downloading some alternative free software, but I rather not do it if possible. I still hope that Windows 7 Enterprise 64bit alone can reinitialize an USB drive without external help. I also cannot do anything with my other 8GB pendrive. It's all an NTFS volume, I tried to delete it, but the option is disabled here too. Maybe I have some settings somewhere that prevents my from partitioning USB disks. (I have the freedom to remove my D: partition which is the second - not counding the "System reserved" - on my SSD disk.)

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• SQL Server performance on VSphere 4.0

  - by Charles

  We are having a performance issue that we cannot explain with our VMWare environment and I am hoping someone here may be able to help. We have a web application that uses a databases backend. We have an SQL 2005 Cluster setup on Windows 2003 R2 between a physical node and a virtual node. Both physical servers are identical 2950's with 2x Xeaon x5460 Quad Core CPUs and 64GB of memory, 16GB allocated to the OS. We are utilizing an iSCSI San for all cluster disks. The problem is this, when utilizing the application under a repeated stress testing that adds CPUs to the cluster nodes, the Physical node scales from 1 pCPU to 8 pCPUs, meaning we see continued performance increases. When testing the node running Vsphere, we have the expected 12% performance hit for being virtual but we still scale from 1 vCPU to 4 vCPUs like the physical but beyond this performance drops off, by the time we get to 8 vCPUs we are seeing performance numbers worse than at 4 vCPUs. Again, both nodes are configured identically in terms of hardware, Guest OS, SQL Configurations etc and there is no traffic other than the testing on the system. There are no other VMs on the virtual server so there should be no competition for resources. We have contacted VMWare for help but they have not really been any suggesting things like setting SQL Processor Affinity which, while being helpful would have the same net effect on each box and should not change our results in the least. We have looked at all of VMWare's SQL Tuning guides with regards to VSphere with no benefit, please help!

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• apache requests failing

  - by Josh

  I'm trying to figure out why sometimes the client fails to load objects/requests from a dynamic page served from Apache/MySql/Debian machine. Let's say 13 objects are to be loaded for a total of 185.3 KB load, with no external objects (no DNS lookups) and no other traffic at the same time, randomly some of those object do not load. However, if I perform a refresh, sometimes all of them load or some might fail again. I only have 1Mbps/up and my DNS is been hosted externally (everydns). What could be the reason of this issue? Any comments will be appreciated.

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• How to get data out of a Maxtor Shared Storage II that fails to boot?

  - by Jonik

  I've got a Maxtor Shared Storage II (RAID1 mode) which has developed some hardware failure, apparently: it fails to boot properly and is unreachable via network. When powering it on, it keeps making clunking/chirping disk noise and then sort of resets itself (with a flash of orange light in the usually-green LEDs); it then repeats this as if stuck in a loop. In fact, even the power button does nothing now – the only way I can affect the device at all is to plug in or pull out the power cord! (To be clear, I've come to regard this piece of garbage (which cost about 460 €) as my worst tech purchase ever. Even before this failure I had encountered many annoyances about the drive: 1) the software to manage it is rather crappy; 2) it is way noisier that what this type of device should be; 3) when your Mac comes out of sleep, Maxtor's "EasyManage" cannot re-mount the drive automatically.) Anyway, the question at hand is how to get my data out of it? As a very concrete first step, is there a way to open this thing without breaking the plastic casing into pieces? It is far from obvious to me how to get beyond this stage; it opens a little from one end but not from the other. If I somehow got the disks out, I could try mounting the disk(s) on one of the Macs or Linux boxes I have available (although I don't know yet if I'd need some adapters for that). (NB: for the purposes of this question, never mind any warranty or replacement issues – that's secondary to recovering the data.)

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• Can't Install Win2k8 On KVM - Classic 0x80070013 error

  - by javano

  I am trying to install Win2k8 Std as a KVM guest on Debian Squeeze. As you can see from these screen shots; No drives are detected (I have blanked out a 20GB image for testing) - screenshot1 I am using this driver CD: - screenshot2 I have signed the Win7 driver (I assume this was the most appropriate one?) - screenshot3 I can now see an unpartitioned drive - screenshot4 But I can't create a new partition on here, getting the error code 0x80070013 - screenshot5 I have had this error code before but only on a physical server. If I remember correctly it was complaining because the disks were partitioned as GPT (because it was a server that was being re-purposed) so repartitioning with an MS-DOS table fixed that. This is a blank disk image though. What is wrong here, and how can I correct this? Thank you. UPDATE I have booted the VM with a Gparted-Live disk and formatted this volume with an MS-DOS partitioning scheme, and a single 20GB NTFS file system. Now when I boot the Win2k8 CD, load my drivers, I get a different error. As you can see at the bottom of screenshot6 "Windows cannot be installed on this hard drive space. Windows must be installed to a partition formatted as NTFS". Clicking format produces the error (0x80004005) on the screen, so I think this is still a driver issue because Windows can see the drive but not interact with it properly. Is that insane thinking?

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• Why does Windows 7 have three system partitions?

  - by Ben

  I am using Windows 7, and I wanted to make a System image (using Windows 7), but Windows 7 checked three partitions as System (100 MB + C (install partition) + D (my partition for my files, all programs are installed at C)). I don't want to backup my D partition, but that is not really the point. I don't want Windows messing with my other partitions and making them system. Is there a way to limit Windows 7 just to partition C (install partition)? If there is no way to stop Windows from making other partitions system, can I at least delete the files that make partition D system? PS: All these three partitions are on one physical disk, partitions from other disks aren't treated as System. FACTS: desktop PC, no OEM partitions, I personally have installed Windows 7 (many times) on the C partition. Why is my D partition checked as System partition when I try to create a System Image (using Windows 7 Ultimate built in tool), even though Windows (and all the software) are installed on the C partition? Is there a way to make D "normal" or non-system partition? Here is a picture of how it looks like if I try to create a system image. Once again, why is D also a system partition?

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• How do you configure ISC Bind to support GSS-TSIG Updates?

  - by netlinxman

  First, has anyone EVER configured ISC bind 9.5.0 OR greater with support for GSS-TSIG Dynamic DNS Updates AND gotten it to work? If so, what is the configuration that was used to make that happen? I feel close to having this working. I see that GSS cred passes w/o apparent error during the TKEY negotiation with an Active Directory DC and the BIND DNS server: client 192.168.0.30#52314: query gss cred: "DNS/[email protected]", GSS_C_ACCEPT, 4294967256 gss-api source name (accept) is [email protected] process_gsstkey(): dns_tsigerror_noerror client 192.168.0.30#52314: send But, when the Update is sent, it is refused: client 192.168.0.30#58330: update client 192.168.0.30#58330: updating zone 'example.com/IN': update failed: rejected by secure update (REFUSED) client 192.168.0.30#58330: send Does anyone have this working in the real world?

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• How to make a bootable USB drive out of a bootable DVD or CD

  - by Svish

  Is there a "universal" way of how you can make a bootable USB drive out of a bootable dvd or cd? What makes a USB drive bootable? What makes a dvd and cd bootable? For example there is a program called UNetBootin which can make bootable USB drives, but seems like it only works with various linux distributions. (Tried it with a Win7 image and the SystemRescueCD, which didn't work so well...). Main reason I ask is that I have a Support DVD which came with an Asus EEE, and it of course doesn't have an external dvd drive. So I am curious if I can sort of move that dvd over to a USB drive so that I can use it without buying one. Not asking just specifically about this one case though, I am curious to know a bit more about this in general. So, if you have a general bootable DVD or CD (Or a DVD or CD image for that matter), could be linux distro, windows install disk, support disks, etc., is it possible to "move" it over to a USB drive and make that work like the DVD or CD did? (Being bootable and all).

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• How do i mitigate DDOS attacks on static servers?

  - by acidzombie24

  Here is a slightly different take on DDOS attacks. Rather than a server with dynamic content being attack i was curious how to deal with attacks on servers with STATIC CONTENT. This means cpu tends to not be an issue. Its either bandwidth or connection problems. How would i mitigate a DDOS attack knowing nothing about the attacker (for example country, ip address or anything else). I was wondering is shorting the timeout and increasing amount of connections is an acceptable solution? Or maybe that is completely useless? Also i would limit the amount of connections per IP address. Would the above help or be pointless? Keeping in mind everything is static checking for multiple request of the same page (html, css, js, etc) could be a sign of a attack. What are some measures i can take on a static content server?

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• Excel - add target line to stacked bar chart

  - by Chris W

  I've got a stacked bar chart. I'm displaying a set of floating bars to represent hi/low ranges for some metrics, by using a transparent fill on the bottom section of the bar I achieve the desired look. What I now need to do is add a horizontal line across the chart to indicate how a particular users score relates to all of these hi/low ranges therefore the placement of this line needs to be dynamic based on a value in a cell. Is there anyway to do this as I can't find an easy option. If this was a simple bar chart I could add the target scores as new series and use the line chart type but I don't seem able to overlay a second series on the stacked bar chart. I'm using 2003 at the moment but run this in 2007 if that helps.

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• Installing Wordpress - constant PHP/MySQL extension appears missing

  - by Driss Zouak

  I've got Win2003 w/IIS6, PHP 5 and MySQL installed. I can confirm PHP is installed correctly because I have a testMe.php that runs properly. When I run the Wordpress setup, I get informed that Your PHP installation appears to be missing the MySQL extension which is required by WordPress. But in my PHP.ini in the DYNAMIC EXTENSIONS section I have extension=php_mysql.dll extension=php_mysqli.dll I verified that mysql.dll and libmysql.dll are both in my PHP directory. I copied my libmysql.dll to the C:\Windows\System32 directory. When I try to run the initial setup for WordPress, I get this answer. I've Googled setting this up, and everything comes down to the above. I'm missing something, but none of the instructions that I've found online seem to cover whatever that is.

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• DNS not responding

  - by Born2win

  I have a Dlink DIR-615 router and I have it around six mounths. My internet connection is VPN (PPTP) based i.e. I have been give a username and password from my isp and my ip address is dynamic. But from few days I am experiencing a serious problem. My router connects normally (i can see yellow light) but my computer is giving "DNS not responding" error. I have tried everything (reset,reboot etc) but no sucess. Any help would be appreciated :)

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• Linux usd disk just create sg device

  - by MTilsted

  I have a Corsair R60 ssd disk which is a disk with both sata and usb connectors. But the usb thing seems to be a bit non-standard, or maybe its just my fedora linux. When I insert the disk using a usb cabel to a running Fedora 14 linux system, a device called /dev/sg3 is added but that is all. No new /dev/sd* device is created so I can't mount the disk. If I look at cat /proc/scsi/sg/device_strs I get ATA Hitachi HTS54321 FB2O HL-DT-ST DVDRAM GSA-T50N RP05 Seagate Desktop 0130 Corsair CSSD-R60GB2 So the disk is there. (The last entry) but my linux will for some reason not see it as a usb hard disk. When I insert other usb disks they work fine. It is only this specific disk which causes problems. I have tried on 3 different computers with the same result. A hint to the problem may be that if I add the disk to a windows system(With usb) the disk is called "A fixed disk" and not a portable disk as expected. The disk works fine with linux If i connect it with the sata cabel, but I would really like to have it working with usb too. (To mount it on computers without sata).

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• Could hybrid SSD + HDD be made with fixed internal partitions?

  - by Aaron

  I was pretty close to getting Seagate's Momentus XT but have been scared off by the many problems reported on forums and feedback sites, especially in Mac Book Pros. So I'm waiting for mk 2 with some extra flash and better reliablilty I'm assuming will come out this year. What would suit me better though is a 32+500 hybrid drive where I have more control over what is on the flash drive and what is on the disk drive. So there are 2 physical partitions within the one 2.5" hard drive enclosure which use different media internally (32GB for core files and 500GB for data and multimedia). The partitions would be locked so they can't be changed. - Or even better, the disk driver just makes them appear as two disks to the OS that share the same bus... Perhaps it's ok if the bios just sees the first drive until the OS is loaded. Is either of it technically possible? Obviously difficult to market outside of the enthusiast market. The SSD memory modules can be pretty small right, so they could even make them a card that plugs into a secondary connection on the enclosure. That would be good for computer builders as well as for upgrading and recoverability. Then future operating systems could recognise these system SSD drives and automatically install the OS + swap files on it. While placing document libraries on the larger data drive. While in the longer term HDD will probably disapear there will always be a trade off between speed, storage size and expense.

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• Make UEFI, GPT, Bootloader, SSD, USB, Linux and Windows work together

  - by user129552

  I like to use the latest hardware and the latest software; thus I have a Laptop (Lenovo X220) with UEFI instead of BIOS an SSD instead of an HDD GPT partitioning scheme instead of MBR USB to boot from instead of optical disks. I need to use both Windows and Linux. I tried to make them work alongside, but I didn't succeed. Most Linux distribution isos don't even really work on UEFI systems booted from USB. (Not even the self-claimed cutting-edge Fedora. I also tried Linux Mint Debian Edition and Sabayon Linux (according to this guide) which did not work. Only Ubuntu worked for me. I first installed Windows 8 which created sda1: Recovery, sda2: EFI system, sda3: msftres, sda4: NTFS Windows. Windows worked without a problem. I then created sda5: linux-swap and installed Ubuntu into sda6: btrfs. After rebooting, I was not presented GRUB2 as expected, but instead my system just booted into Ubuntu. I could no longer access Windows. After fixing dpkg in btrfs Ubuntu, I followed the Ubuntu documentation on UEFI booting. The result left me with a broken GRUB2, but interestingly, when I wanted to select the device to boot from, I was not only presented the internal SSD, an attached USB device, or LAN, but also Grub2 (broken), Ubuntu and Windows. The result is not very satisfying to me. What would I have to do to fix everything? Or differently asked, what operating system should I install at what point given my possibilities and requirements, so that I have a working bootloader in my UEFI GPT system which presents me a working Linux and Windows.

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• Can't mount Linux usd disk. It just create /dev/sg device but no /dev/sd

  - by MTilsted

  I have a Corsair R60 ssd disk which is a disk with both sata and usb connectors. But the usb thing seems to be a bit non-standard, or maybe its just my fedora linux. When I insert the disk using a usb cabel to a running Fedora 14 linux system, a device called /dev/sg3 is added but that is all. No new /dev/sd* device is created so I can't mount the disk. If I look at cat /proc/scsi/sg/device_strs I get ATA Hitachi HTS54321 FB2O HL-DT-ST DVDRAM GSA-T50N RP05 Seagate Desktop 0130 Corsair CSSD-R60GB2 So the disk is there. (The last entry) but my linux will for some reason not see it as a usb hard disk. When I insert other usb disks they work fine. It is only this specific disk which causes problems. I have tried on 3 different computers with the same result. A hint to the problem may be that if I add the disk to a windows system(With usb) the disk is called "A fixed disk" and not a portable disk as expected. The disk works fine with linux If i connect it with the sata cabel, but I would really like to have it working with usb too. (To mount it on computers without sata).

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• vSphere - datastore falling off a host

  - by Chadddada

  Recently we have been running the vCheck powershell script daily in order to help in monitoring our vSphere ESX 4.0 environment. One of the oddities that we have been seeing is that some of the datastores on the SAN don't always show up on every host. Our hosts are connected redundantly, via FC, to some brocade FC switches, which then connect via fiber to our EMC Ax4 SAN. While all the datastores are presented to each host we have, and they see them initially, they sometimes seem to fall off and are no longer visible. It easy enough to rescan for datastores and add them back to the hosts the hosts but this seems to be an error. Has anyone else seen this or know why it may be happening? Responses to questions: 1. Is it always the same ESX servers that lose their connection? – Scott Warren No this happens randomly on random hosts. If a VM is running on a particular host, of which the VM's disks are on a SAN datastore, then that datastore won't disappear. It seems to happen if a host doesn't touch a datastore for a bit and it just forgets about it.

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