[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] anyone using dm-cache?
Hi, 2011/6/24 Rudi Ahlers <Rudi@xxxxxxxxxxx>: > I'm looking for a way to speed up SAN based storage on a CentOS 5.6 + XEN > Hypervisor which uses iSCSI mounted SAN storage. dm-cache seems like it do I think the "write-through-write-around" (wt) version of flashcache[*] might be better for the SSD caching use case. I haven't tried it but you just basically made me stumble over it and it seems the right thing for a Xen host. There's also documentation on using it with Centos5.4 - good enough? :) A write-back cache is also possible (and there's more work ongoing to add something like that to linux) but I think a busy VM host will eat through a SSD in too short time if we're caching writes. I want to use that on my hosts since they only have 8 disks slots (so 6 normal 10k/15k disks on raid controller & 1 ssd & tbd).With a "real" SAN I'd just trust in a reasonable number of raid10 spindles though - SAN storage should be faster, not slower than local disks :> > Does anyone use it? > Any feedback? Pitfalls? Success stories? As to actual _use_ i noted XCP 1.0 has "local storage caching" but there is no documentation what makes up that feature. [*] https://github.com/facebook/flashcache Regards, Florian -- the purpose of libvirt is to provide an abstraction layer hiding all xen features added since 2006 until they were finally understood and copied by the kvm devs. _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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