Well been running a week now and problems again. 3 3 terrabyte drives are _at_85% with compression enabled, i have to wonder if that is part of the problem. Dan. -- Dan The Man CTO/ Senior System Administrator Websites, Domains and Everything else http://www.SunSaturn.com Email: Dan_at_SunSaturn.com On Wed, 9 Nov 2011, Kurt Touet wrote: > On Wed, Nov 9, 2011 at 1:07 AM, Daniel O'Connor <doconnor_at_gsoft.com.au> wrote: >> >> On 09/11/2011, at 17:32, Garrett Cooper wrote >>>> dd's of large files (spooled backups going to tape) to /dev/null are as slow as Samba. >>> >>> - Dedupe? >> >> Nope. >> >>> - Compression? >> >> On the mail spool & ports, but not on the tape spool. >> >>> - How much RAM? >> >> 8GB. >> >>> - What debug options do you have enabled in the kernel? >> >> It is 8.2-GENERIC so.. no WITNESS (for example) >> >>> I've been noticing a slowdown in some respects with NFS/SMB, but I >>> suspected it was because I have an re(4) based NIC. ZFS has also wired >>> down a lot of my system memory for the L2ARC… >> >> >> re isn't great but I wouldn't expect it to slow down over time.. Unless bounce buffers got used more and more or something. >> >> I have an em0 card in this system - but in any case it is slow locally (i.e. dd a large file with 64k block size). >> >> -- >> Daniel O'Connor software and network engineer >> for Genesis Software - http://www.gsoft.com.au >> "The nice thing about standards is that there >> are so many of them to choose from." >> -- Andrew Tanenbaum >> GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C >> >> > > Right now (while experience slow writes via samba+zfs) this is general > read speed off a 4 x 1.5TB sata2 raidz1: > > # dd if=test.file of=/dev/null > 13753502+1 records in > 13753502+1 records out > 7041793036 bytes transferred in 100.020897 secs (70403218 bytes/sec) > > That's not in the same ball park of slow writes, but it is below what > I expect for reads. > > My setup is a little odd: 4x1.5tb raidz sata2 on mobo + 2 x 2tb > mirror on sata1 pci controller, zfs v28, stable/9 r227357, amd x4 810 > 2.6ghz, 4gb ram, no dedupe, no compression, daily snapshots saved for > 7 days > > The above file read was stored before the 2 x 2tb mirror addition, so > it was a solely read off the sata2 mobo ports. Reading off of > something more recent (and split amongst both raidz1 and mirror > vdevs): > > # dd if=test2.file of=/dev/null > 9154715+1 records in > 9154715+1 records out > 4687214153 bytes transferred in 82.963181 secs (56497522 bytes/sec) > > This is, again, seems slower than usual, but not as terrible as the > write speeds that I've been seeing via samba. >Received on Sat Nov 12 2011 - 09:55:42 UTC
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