Re: [zfs-discuss] ZFS slowness under domU high load

2010-02-15 Thread Bogdan Ćulibrk
zfs ml wrote: sorry, scratch the above - I didn't see this: 9. domUs have ext3 mounted with: noatime,commit=120 Is the write traffic because you backing up to the same disks that the domUs live on? Yes it is. ___ zfs-discuss mailing list

Re: [zfs-discuss] ZFS slowness under domU high load

2010-02-15 Thread Bogdan Ćulibrk
Kjetil and Richard thanks for this. Kjetil Torgrim Homme wrote: Bogdan Ćulibrk b...@default.rs writes: What are my options from here? To move onto zvol with greater blocksize? 64k? 128k? Or I will get into another trouble going that way when I have small reads coming from domU (ext3 with

Re: [zfs-discuss] ZFS slowness under domU high load

2010-02-15 Thread Daniel Carosone
On Mon, Feb 15, 2010 at 01:45:57PM +0100, Bogdan ?ulibrk wrote: One more thing regarding SSD, will be useful to throw in additional SAS/SATA drive in to serve as L2ARC? I know SSD is the most logical thing to put as L2ARC, but will conventional drive be of *any* help in L2ARC? Only in

[zfs-discuss] ZFS slowness under domU high load

2010-02-14 Thread Bogdan Ćulibrk
Greetings zfs-discuss@ I was trying to narrow this down for some quite time. The problem is resides on couple of osol/sxce boxes that are used as dom0 hosts. Under high disk load on domU guests (backup process for example) domU performance is terrible. The worst thing is that iostat shows

Re: [zfs-discuss] ZFS slowness under domU high load

2010-02-14 Thread Richard Elling
On Feb 14, 2010, at 9:24 AM, Bogdan Ćulibrk wrote: Greetings zfs-discuss@ I was trying to narrow this down for some quite time. The problem is resides on couple of osol/sxce boxes that are used as dom0 hosts. Under high disk load on domU guests (backup process for example) domU

Re: [zfs-discuss] ZFS slowness under domU high load

2010-02-14 Thread Bogdan Ćulibrk
Richard first of all thank you for your time looking into this, apricieting that. What are my options from here? To move onto zvol with greater blocksize? 64k? 128k? Or I will get into another trouble going that way when I have small reads coming from domU (ext3 with default blocksize of 4k)?

Re: [zfs-discuss] ZFS slowness under domU high load

2010-02-14 Thread Kjetil Torgrim Homme
Bogdan Ćulibrk b...@default.rs writes: What are my options from here? To move onto zvol with greater blocksize? 64k? 128k? Or I will get into another trouble going that way when I have small reads coming from domU (ext3 with default blocksize of 4k)? yes, definitely. have you considered

Re: [zfs-discuss] ZFS slowness under domU high load

2010-02-14 Thread zfs ml
On 2/14/10 4:12 PM, Kjetil Torgrim Homme wrote: Bogdan Ćulibrkb...@default.rs writes: What are my options from here? To move onto zvol with greater blocksize? 64k? 128k? Or I will get into another trouble going that way when I have small reads coming from domU (ext3 with default blocksize of

Re: [zfs-discuss] ZFS slowness under domU high load

2010-02-14 Thread zfs ml
On 2/14/10 7:02 PM, zfs ml wrote: On 2/14/10 4:12 PM, Kjetil Torgrim Homme wrote: Bogdan Ćulibrkb...@default.rs writes: What are my options from here? To move onto zvol with greater blocksize? 64k? 128k? Or I will get into another trouble going that way when I have small reads coming from