http://oss.sgi.com/bugzilla/show_bug.cgi?id=840
--- Comment #2 from bloodyscarion@xxxxxxxxx 2009-06-22 07:16:12 CST ---
(In reply to comment #1)
> Given that you are running LVM on an old kernel I suspect you were having
> write
> through caches enabled on the disks? In that case any filesystem can't work
> reliably and you will get corruptions especially of the allocation btrees.
Thank you for the answer!
This is configuration of one of virtual disks on the controller:
ID : 0
Status : Ok
Name : Array0
State : Ready
Progress : Not Applicable
Layout : RAID-5
Size : 1,953.12 GB (2097149902848 bytes)
Device Name : /dev/sdc
Type : SAS
Read Policy : Adaptive Read Ahead
Write Policy : Write Back
Cache Policy : Not Applicable
Stripe Element Size : 64 KB
Disk Cache Policy : Disabled
As you can see I have disk cache disabled, but write policy is "Write Back". It
seems to be secure having controller battery installed:
http://support.dell.com/support/edocs/software/svradmin/5.1/en/omss_ug/html/cntrls.html#681536
Controller PERC 5/E Adapter (Slot 1)
ID : 0
Status : Ok
Name : Battery 0
State : Ready
Recharge Count : Not Applicable
Max Recharge Count : Not Applicable
Predicted Capacity Status : Ready
Learn State : Idle
Next Learn Time : 43 days 18 hours
Maximum Learn Delay : 7 days 0 hours
Is it OK?
Maybe I just should disable write caching completely?
Best regards,
Tomek Kruszona
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