Hello!
We have a Windows Server 2008 Standart SP2 x64, which is connected via two HBAs QLogic QLA2440 to a Storage Xyratex F5402. On DS5402 are located three LUNs for the corporate file storage. These LUNs are displayed in Windows Server as local disks E F G.
As the MPIO software it is used Xyratex Storview Pathmanager 6.00.5016.14 (Microsoft MPIO Driver 6.0.6002.18005) in Failover\Failback configuration, and three disks are adjusted for work on three different ways.
It is all normally worked since 2008
But problems have begun with the beginning of this year.
In operation time any of the SAN disks falls off. With a F5402 all is normal and its logs there are no errors.
In Windows Event System Log the folowing errors and warnings:
EventID: 515, Source: xyrsp200 (Xyratex F5402E Multi-Path Device Specific Module). The path for logical drive [SN: 60050CC00020188D0000000000000007] has failed over to [0005 4:0:1:2] because of a path error.
EventID: 23, Source: mpio. Errors in all ways. \Device\MPIODisk2 it will be removed.
EvetID: 260, Source: xyrsp200 The active path on logical drive [SN: 60050CC00020188D0000000000000007] has been switched to the preferred path on [0005 5:0:0:2].
EventID: 15, Source: disk. Access to the device \Device\Harddisk5\DR5 while is impossible
and further an disk erors...
Disk reloading in Windows Disk Manager doesn't help. I am compelled to reboot the server. After reboot all works as though anything and wasn't to the following such case.
As fall off not all LUNы at once (one can fall off, others and will to work normally) a problem probably either in Windows or in Xyratex Storview Pathmanager.
After adjustment of monitoring I have found out that at the moment of failure the current queue of a falling disk was 6 and the size of operation of record on a disk has sharply increased.
May be the disk simply hasn't sustained loading (though strange - Fiber-Chaneell, and High-Perfomance Disks Storage). In Windows it can be somehow possible to optimize operations of work with disks that there were no such falls.
I need a help !!!
Andy Mishechkin