# [OmniOS-discuss] Restrucuring ZPool required?

Olaf Marzocchi lists at marzocchi.net
Mon Jun 18 07:33:14 UTC 2018

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    In that page you should also check the raw output of dd, showing in the last column the IOPs.

    Olaf

    Il 18 giugno 2018 08:50:16 CEST, priyadarshan <priyadarshan at scs.re> ha scritto:
    >
    >> On 18 Jun 2018, at 08:27, Oliver Weinmann
    ><oliver.weinmann at icloud.com> wrote:
    >>
    >> Hi,
    >>
    >> we have a HGST4u60 SATA JBOD with 24 x 10TB disks. I just saw that
    >back then when we created the pool we only cared about disk space and
    >so we created a raidz2 pool with all 24disks in one vdev. I have the
    >impression that this is cool for disk space but is really bad for IO
    >since this only provides the IO of a single disk. We only use it for
    >backups and cold CIFS data but I have the impression that especially
    >running a single VEEAM backup copy job really maxes out the IO. In our
    >case the VEEAM backup copy job reads and writes the data from the
    >storage. Now I wonder if it makes sense to restructure the Pool. I have
    >to admit that I don't have any other system with a lot of disk space so
    >I can't simply mirror the snapshots to another system and recreate the
    >pool from scratch.
    >>
    >> Would adding two ZIL SSDs improve performance?
    >>
    >> Any help is much appreciated.
    >>
    >> Best Regards,
    >> Oliver
    >
    >Hi,
    >
    >I would be interested to know as well.
    >
    >Sometimes we have same issue: need for large space vs need to optmise
    >for speed (read, write, or both). We also are using, at the moment,
    >10TB disks, although never do RAID-Z2 with more than 10 disks.
    >
    >This page has some testing that was useful to us:
    >https://calomel.org/zfs_raid_speed_capacity.html
    >
    >Section «Spinning platter hard drive raids» has your use case (although
    >4TB, not 10TB):
    >
    >24x 4TB, 12 striped mirrors,   45.2 TB,  w=696MB/s , rw=144MB/s ,
    >r=898MB/s
    >24x 4TB, raidz (raid5),        86.4 TB,  w=567MB/s , rw=198MB/s ,
    >r=1304MB/s
    >24x 4TB, raidz2 (raid6),       82.0 TB,  w=434MB/s , rw=189MB/s ,
    >r=1063MB/s
    >24x 4TB, raidz3 (raid7),       78.1 TB,  w=405MB/s , rw=180MB/s ,
    >r=1117MB/s
    >24x 4TB, striped raid0,        90.4 TB,  w=692MB/s , rw=260MB/s ,
    >r=1377MB/s
    >
    >Different adapters/disks will change the results, but I do not thing
    >ratio will change much.
    >
    >It would be interesting to see how ZIL would affect that.
    >
    >
    >Priyadarshan
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