Re: [zfs-discuss] [zfs-code] Peak every 4-5 second

[Tharindu Rukshan Bamunuarachchi]

Deal All, Thank you very much for the continuous support .... Sorry for the late reply ... I was trying to allocate 2540 & 2 x 4600 for try out your recommendation ... Finally, I could reserve 2540 disk array for testing purpose. so I am free to try out each and every points you have emphasized over next week or two. Current Volume setup is something like ... I have created Storage Profile with RAID1 (there was no option for either RAID 1+0 or RAID 0+1, may be due to CAM version.) No read ahead. 16kb segment size. 4 physical SAS disks have been allocated for each volume. So I got 2disk size effective space. Particular 272GB volume is mounted as ZFS pool. (We need at least 3 independent volumes to start our system) This is my plan for next week ... 1.Re configure array with 12 independent disks 2. Allocate disks to RAIDZed pool 3. Fine tune the 2540 according to Bob's 2540-ZFS-Performance.pdf (Thankx Bob) 4. Apply ZFS tunings (i.e. zfs_nocacheflush=1 etc.) Did I miss anything .... However, I could not find additional cards to support I/O Multipath. Hope that would not affect on latency. Thankx again ... Cheers Tharindu David Collier-Brown wrote: Brandon High wrote: On Fri, Jul 25, 2008 at 9:17 AM, David Collier-Brown <[EMAIL PROTECTED]> wrote: And do you really have 4-sided raid 1 mirrors, not 4-wide raid-0 stripes??? Or perhaps 4 RAID1 mirrors concatenated? I wondered that too, but he insists he doesn't have 0+1 or 1+0... Tharindu. could you clarify this for us? It significantly affects what advice we give! --dave (former tech lead, performance engineering at ACE) c-b

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