I get 200MB on a cold day and 500 on a nice one from this SAN. These 40-50MB/s seem really being limited by pvmove alone. Nothing else shows this limit. That's why I'm asking. Vennlig hilsen / Best regards roy -- Roy Sigurd Karlsbakk (+47) 98013356 http://blogg.karlsbakk.net/ GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt -- Da mihi sis bubulae frustrum assae, solana tuberosa in modo Gallico fricta, ac quassum lactatum coagulatum crassum. Quod me nutrit me destruit. ----- Original Message ----- > From: "L A Walsh" <lvm@tlinx.org> > To: "linux-lvm" <linux-lvm@redhat.com> > Sent: Friday, 17 February, 2017 01:44:36 > Subject: Re: pvmove speed > Roy Sigurd Karlsbakk wrote: >>> I'm doing pvmove of some rather large volumes from a Dell Equallogic system to >>> Dell Compellent. Both are connected on iSCSI .... > ---- > I've never had very great speeds over a network. I've gotten the > impression > that iSCSI is slower than some other network protocols. > > Locally (RAID=>RAID) I got about 400-500MB/s, but the best I've > gotten, recently, over a 10Gb network card has been about 200MB/s. > Oddly, when I first got the cards, I was getting up to 400-600MB/s, but > after MS started pushing > Win10 and "updates" to Win7 (my communication has been between > Win7SP1<->linux server), my speed dropped to barely over 100MB/s which > is about what I got with > a 1Gb card. I wasn't able to get any better speeds using *windows* > single-threaded SMB proto even using 2x10Gb (have a dedicated link tween > workstation and server) -- but I did notice the cpu maxing out on either the > windows or the Samba side depending on packet size and who was doing the > sending. > > 50MB sounds awfully slow, but not out of the ballpark -- I had > benched a few > NAS solutions @ home, but could rarely get about 10MB/s (usually > slower), so gave up on those and went w/a linux server -- but still alot > slower than I'd > like (100-200MB/s sustained, but those figures may change w/the next MS > "update"). But gave up on commercial, out-of-the-box solutions, and the > 4x1Gb > connect you have may be costing you more cpu than its worth... Problem I > noted > on 2x10G was too many duplicate packets -- so running 1x10Gb now but > still maxing out around 200MB/s over an unencrypted SMB/CIFS session. > > I'm not sure it could be an LVM problem given its local speed for > pvmoves -- > do you have some measurement of faster file I/O throughput using iSCSI > over your > connections? > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
