On 2013-04-23 10:14, ProbaNet - Info wrote: > Hello guys! > We're using openafs 1.6 fileserversand we would like to know if we > can do something to improve performance (we mean: parameters and values). > Scenario: > - 3 fileservers, all 64 bit KVM virtual machines with4 vCPU, 1280 MB RAM > and 4 x 250 GB vice partitions (which are iSCSI targets)
One note: thats quite low memory. Our Fileservers (real hardware) do have 16GB for linux caches on the FS. That does help. And we do have iSCSI also - which does need some space for cache, too. With this setup you need to check the iSCSI connection and the storage itself - e.g. fine to have 3 FS, but what if the storage is a breaker in this case, 2 RW volumes from 2 FS on 2 iSCSI targets on the same RAID6 is e.g. a breaker... Also all 3 FS on one KVM Host (physical machine) is not a wise idea, performance wise... > - 2 dbservers (1 sync site + 1 non-voting clone), 64 bit KVM vms, 2 > vCPU, 512 MB RAM Non-voting-clone? Usual both servers do sync and both are available to clients. Those do not need much. > - everything runs into an office LAN (1 Gbit), with around 40 users > - each fileserver hosts 200 to 600 volumes Yeah, quite usual. > Here's actual BosConfig for dbservers: > ----- > restarttime 16 0 0 0 0 > checkbintime 16 0 0 0 0 > bnode simple ptserver 1 > parm /usr/lib/openafs/ptserver -p 16 > end > bnode simple vlserver 1 > parm /usr/lib/openafs/vlserver -p 16 > end > ----- Not much to say, dbservers are quite low profile, but important ;-) > Here's actual BosConfig for fileservers: > ----- > restrictmode 0 > restarttime 16 0 0 0 0 > checkbintime 16 0 0 0 0 > bnode fs fs 1 > parm /usr/lib/openafs/fileserver -L -udpsize 65536 -cb 600000 -rxpck > 4000 -vattachpar 8 -realm XXX.YYY > parm /usr/lib/openafs/volserver -p 16 -udpsize 65536 > parm /usr/lib/openafs/salvager -parallel all4 -orphans remove > end > ----- Ours (after some discussion in ML): parm /usr/lib/openafs/fileserver -L -udpsize 131071 -sendsize 131071 -rxpck 700 -p 128 -b 600 -nojumbo -cb 1500000 parm /usr/lib/openafs/volserver -nojumbo -udpsize 131071 which does start some processes in parallel (hence the memory). > Everything works quite fine (except for some occasional slowdown when > accessing some volume for the first time), but we would like to know if > we can do something to improve it! :) Thank you very much! Depends on the current values you got currently ;-) Our setup is nice in the 30-50 MB/sec usage in every-day use. Up to 90 MB/sec on big files (images) read from/to cache (memory...). > Stefano > Fabio MfG, Lars Schimmer -- ------------------------------------------------------------- TU Graz, Institut für ComputerGraphik & WissensVisualisierung Tel: +43 316 873-5405 E-Mail: [email protected] Fax: +43 316 873-5402 PGP-Key-ID: 0x4A9B1723
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