On Thu, Jul 29, 2010 at 6:04 PM, Carol <holaaqu...@yahoo.com> wrote: > Richard, > > I disconnected all but one path and disabled mpxio via stmsboot -d and my > read performance doubled. I saw about 100MBps average from the pool. > > BTW, single harddrive performance (single disk in a pool) is about 140MBps. > > What do you think? > > Thank you again for your help! > >
I somehow doubt nearline 2TB drives will do 140MB/sec. Maybe on the outter tracks, and only on optimum block sizes, with sequential reads. You mentioned you were using COMSTAR, and depending on the initiator OS, and the device you are mapping to to create the LUN (/dev/dsk or /dev/rdsk), you may be writing 512byte blocks to ZFS. Search older threads for rdks vs. dsk performance with COMSTAR. Also, see what block size you are using on the initiator, if in fact you are using COMSTAR. I found absolutely terrible COMSTAR performance when the initiator FS was using anything less than 8KB blocks, too many small sync writes over iSCSI = death for storage performance. Go the usual route at looking at jumbo frames, flow control on the switches, etc. -- Brent Jones br...@servuhome.net
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