Hi,
I am evaluating vdo for an hyperconverged ovirt cluster.
The volume is on RAID device supported by a LSI (Dell Perc H710) controller
with Write Back cache enabled :
Current Cache Policy: WriteBack, ReadAdaptive, Cached, Write Cache OK
However these LSI controllers (all PERC series on Dell servers), as per
documentation, always report cache policy as writethrough to the OS, no matter
if write back is effectively enabled or not :
cat /sys/block/sdb/device/scsi_disk/0\:2\:1\:0/cache_type
write through
vdo by default choose its write policy (sync or async) accoring to the cache
mode reported by the disk. So with cache policy auto, in that case it is set to
"sync" :
write policy: sync
So my question :
In this configuration, write cache enabled on the raid controller but reported
as write trhough to the os, should I manually set vdo cache policy to async for
optimal performance?
Thanks for your help
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