Orvar Korvar wrote: > I am using 4 SATA II drives, with this card (see the comments) which > got detected by Solaris automatically: > http://napobo3.blogspot.com/2006/04/sata2-under-b36.html On there you posted: > However, I get very slow read/write perfomance. I have 4 samsung > 500GB each should reach 60mb/sec. Now, in total I have like > 20-40MB/sec for the whole zpool. And when I read from ntfs I get like > 100kb/sec. Why is that?
So, ZFS performance is 200-400 times the performance of NTFS. Nice. ZFS gets its throughput speeds by does everything it can to run at cpu/bus/hba/spindle speeds. Increase the slowest of the four and things normally speed up. The CPU you have is plenty fast. The drives you have are plenty fast. Now evaluate the bus/hba speeds... > > I understand that my 32bit CPU is the limiting factor? But that seems > a bit strange I think. A [EMAIL PROTECTED] should be able to squeese out ~5 > GFlops, and one thinks that should be plenty for a file system as ZFS? > Well, I hope to upgrade to Penryn later this year, and then I really > hope it will be faster than 15MB/sec transfer rate. > When looking at bottlenecks, you must look at the full data path. Where I would look for the bottleneck is the HBA... Between the data path components (CPU, Bus, HBA, Disk), the CPU does not appear to be the weak link. If you CPU utilization (see prstat) is not above say 50%, then look elsewhere. > (I have a ASROCK P4V88 motherboard, which I have inserted the PCI-X > SATA card into. The mobo doesnt have PCI-X, but the card reverts to > ordinary PCI when inserted and it works right out of the box). Going from PCI-X speeds to 32bit 33Mhz PCI speeds is a drastic bottleneck, see "http://www.pcisig.com/specifications/pcix_20/";. Replacing the Motherboard with one that is capable of passing data (CPU <-> bus <-> hba <-> disk) with a higher ***minimum*** speed throughout would help. Old lesson from Seymour Cray, see "http://en.wikipedia.org/wiki/Seymour_Cray";. Shameless plug: Sun designs all the systems this way, see "http://www.sun.com/servers/entry/x2100/specs.xml#anchor1";. Cheers, Joel.
begin:vcard n:Buckley;Joel fn:Joel W. Buckley tel;fax:303-272-4867 tel;home:720-226-9370 tel;work:303-272-5556 url:http://avt-central.east.sun.com:81/index.php/Main_Page http://webhome.central/jist org:Systems Group;Engineering Automation adr:;;500 Eldorado Blvd., BRM05, Room3196;Broomfield;Colorado;80021-3400;USA version:2.1 email;internet:[EMAIL PROTECTED] title:JIST Development Lead end:vcard
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