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Win2003 under Xen 5.5 drops iscsi mounted disks, reports as missing or failure.

Posted on 2010-08-16
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Last Modified: 2013-11-11
Hi lads.
One of my customers have a weird problem (and rather annoying).
The setup is as following.
2 * IBM X3550
Xen 5.5 (latest update)
1 * IBM DS3400 ISCSI (lastest f/w and microcode on controller and disks)
1 * IBM EXP3200 (lastest f/w on disks)

Under this setup there is only one VM, a Win2003 x86 with all winupdates installed.
Running IBM Fastback 6.1.1. as DR HUB.
Mounted to this OS is 6 * 2048GB partitions.

This setup has ran fine since feb -10, but under the summer vacation all 2TB partitions has gone missing or failed, OS is still intact tho, which is weird since all files are on the same SAN.
The SAN doesnt report any problem, nor Win2003 logs, more than a NTFS error occured on /lunxx/(SAN disks).

Ive logged a case to IBM and they have a 2nd line tech on it, but cant find any errors.

Do anyone of you pro's have any idea where i could start look, since there aint a option to acctually delete the SAN partitions and recreate them. The customers wont allow it.
IMO there must be a "flaw" or bug somewhere, and i really hope i could reconnect the disks again w/o deleting everything, shrugs.

Regards

/Z
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Question by:Zaxxon2009
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by:Karma_AU
ID: 33444510
That is a weird issue.

If you use a workstation and grab the microsoft iscsi initializer does it work?
http://www.microsoft.com/downloadS/details.aspx?FamilyID=12cb3c1a-15d6-4585-b385-befd1319f825&displaylang=en 

If it does then we should look at the server. If it doesn't work then it is the San.

Regards
Daniel
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Author Comment

by:Zaxxon2009
ID: 33445591
Re: 16/08/10 03:51 AM, ID: 33444510

I downloaded the iscsi initiator, but the SAN and HOST HBA uses and completely diff IP and subnet, due to security, so its a bit messy to acctual try discover the iscsi san from a workstation. It could work if i ran the traffic through at swicth, but as it is now, its crosscable connected directly to the SAN (not my solution).

Atm im running: check logicalDrive ["Data01"] parity parityErrorFile="C:\D1parity.txt" mediaErrorFile="C:\Data01.txt" priority=medium verbose=TRUE; on the SAN. which will take some time.

Regards
/Peter
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Author Comment

by:Zaxxon2009
ID: 33454297
Update! After 2 days of diskcheck, the volumes are clean. Aka, no problems at all.
If someone have any clue what could have caused this, please give me a note.

Thanx

/Peter
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Expert Comment

by:Karma_AU
ID: 33459912
I manage over 50 servers accross multiple sites and as a health check I run a chkdsk once a month. I have never had anything bad happen from running it. So many times I hit a problem  on both servers and workstations that is solved by running chkdsk. . You may want to schedule a chkdsk to run over the weekend or if it is going to take that long do it every long weekend as most people head off for the break.

I have seen a faulty raid controller cause chkdsk to constantly find issues. Due to the large number of files chkdsk found on the drive for safety reasons I restored the server from a backup image.
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Zaxxon2009 earned 0 total points
ID: 33734144
This is the report i got from Microsoft.

Dynamic disks on Windows Server 2003, Windows XP and Windows 2000
Configuring volumes on iSCSI disks as Dynamic disk volumes using the Microsoft software iSCSI initiator is not currently supported.  It has been observed that timing issues may prevent dynamic disk volumes on iSCSI disks from being reactivated at system startup.

Dynamic disks is not supported using Iscsi and windows 2003, if it is using 3rd party, like IBM in this case is not even contemplated in our support.

My solution was to upgrade the entire server to Win2008 to solve the problem.
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