Unsolved
This post is more than 5 years old
21 Posts
0
80306
Write Policy - PERC BIOS vs. OMSA
I'm getting a conflict between PERC BIOS and OMSA on the write policy of a virtual disk. As you can see below the PERC BIOS shows Write Back, however OMSA is reporting Write Through. I'm not using certified enterprise drives, which I'm hoping is the root of the issue. Is there a way to definitively determine which policy the system is using? I'm OK with the issue being OMSA isn't reporting the write policy correctly, however I want to be sure the virtual disk is using write back. This is a PERC H800 with 6 Samsung SSD 840 Series in a RAID10. Let me know if there is any other info needed.
/opt/dell/srvadmin/bin#./omreport storage vdisk controller=0 vdisk=0
Virtual Disk 0 on Controller PERC H800 Adapter (Slot 1)
Controller PERC H800 Adapter (Slot 1)
ID : 0
Status : Ok
Name : WARM_SNDBY_DB
State : Ready
Hot Spare Policy violated : Not Assigned
Encrypted : No
Layout : RAID-10
Size : 1,395.75 GB (1498675150848 bytes)
Device Name : /dev/sda
Bus Protocol : SATA
Media : SSD
Read Policy : Adaptive Read Ahead
Write Policy : Write Through
Cache Policy : Not Applicable
Stripe Element Size : 64 KB
Disk Cache Policy : Enabled
/opt/dell/srvadmin/bin#./omconfig storage vdisk controller=0 vdisk=0 action=changepolicy writepolicy=wb
Command successful!
/opt/dell/srvadmin/bin#./omreport storage vdisk controller=0 vdisk=0
Virtual Disk 0 on Controller PERC H800 Adapter (Slot 1)
Controller PERC H800 Adapter (Slot 1)
ID : 0
Status : Ok
Name : WARM_SNDBY_DB
State : Ready
Hot Spare Policy violated : Not Assigned
Encrypted : No
Layout : RAID-10
Size : 1,395.75 GB (1498675150848 bytes)
Device Name : /dev/sda
Bus Protocol : SATA
Media : SSD
Read Policy : Adaptive Read Ahead
Write Policy : Write Through
Cache Policy : Not Applicable
Stripe Element Size : 64 KB
Disk Cache Policy : Enabled
vpsa
21 Posts
0
May 7th, 2013 09:00
Hi Chris,
I'm pretty sure I had performed a full system restart after changing the write policy, however I just did an OMSA service restart and I'm still seeing the same write through policy.
DELL-Chris H
Moderator
Moderator
•
8.4K Posts
0
May 7th, 2013 09:00
VPSA,
Have you restarted OMSA since changing the write policy?
DELL-Chris H
Moderator
Moderator
•
8.4K Posts
0
May 7th, 2013 10:00
Thank you. What is OMSA showing the battery status as? If the battery backed cache is down then it will auto convert to write through until the cache is restored.
vpsa
21 Posts
0
May 7th, 2013 11:00
Learn State is Idle:
./omreport storage battery controller=0
Battery 0 on Controller PERC H800 Adapter (Slot 1)
Controller PERC H800 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 : 76 days 4 hours
Maximum Learn Delay : 7 days 0 hours
Learn Mode : Auto
Thanks
vpsa
21 Posts
0
May 7th, 2013 12:00
Hmm, I wonder if there is something up with the battery? I can successfully change the policy to force write back:
Command successful!