[linux-lvm] Performance penalty for 4k requests on thin provisioned volume
zkabelac at redhat.com
Thu Sep 14 09:37:21 UTC 2017
Dne 14.9.2017 v 11:00 Zdenek Kabelac napsal(a):
> Dne 14.9.2017 v 00:39 Dale Stephenson napsal(a):
>>> On Sep 13, 2017, at 4:19 PM, Zdenek Kabelac <zkabelac at redhat.com> wrote:
>> md127 is an 8-drive RAID 0
>> As you can see, there’s no lvm striping; I rely on the software RAID
>> underneath for that. Both thick and thin lvols are on the same PV.
>>> SSD typically do needs ideally write 512K chunks.
>> I could create the md to use 512k chunks for RAID 0, but I wouldn’t expect
>> that to have any impact on a single threaded test using 4k request size. Is
>> there a hidden relationship that I’m unaware of?
> Yep - it seems the setup in this case is the best fit.
Sorry my typo here - is NOT ;)
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