Hi All,
I'm a little stuck, we have a customer with an IBM x3650 M4, Raid 5 over 8 disks (yes i know not good, but it is what it is).
We've added 2 more disks and performed a raid migration, same raid 5 and utilizing the new disks.
However the server has slowed to a crawl, disk queue is shooting from 8->20 but the VM's it runs are virtually unusable (small company so exchange, dc and app server all on this hardware). Latency is anywhere from 150+ on the host and 1000+ on the VM's!!!
Any black art of megaraid controllers I don't know about? I know a raid 5 rebuild has some performance impact but the task rates are set to 30% for everything, surely it shouldnt bring things to a standstill?
Controller is an m5110e with BBU and was in write back mode (now changed to write through during this rebuild???, wont allow me to change back)
is there an expand option instead of doing a raid migration to utilise new disks?
disks are 500GB, we only expanded with 1 disk first of all and its taken about 7 hours at 38%
Thanks
Ash
I'm a little stuck, we have a customer with an IBM x3650 M4, Raid 5 over 8 disks (yes i know not good, but it is what it is).
We've added 2 more disks and performed a raid migration, same raid 5 and utilizing the new disks.
However the server has slowed to a crawl, disk queue is shooting from 8->20 but the VM's it runs are virtually unusable (small company so exchange, dc and app server all on this hardware). Latency is anywhere from 150+ on the host and 1000+ on the VM's!!!
Any black art of megaraid controllers I don't know about? I know a raid 5 rebuild has some performance impact but the task rates are set to 30% for everything, surely it shouldnt bring things to a standstill?
Controller is an m5110e with BBU and was in write back mode (now changed to write through during this rebuild???, wont allow me to change back)
is there an expand option instead of doing a raid migration to utilise new disks?
disks are 500GB, we only expanded with 1 disk first of all and its taken about 7 hours at 38%
Thanks
Ash
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