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Thread: 650,000 Mailbox Migration Qmail-LDAP 2 Zimbra NE

  1. #21
    bonoboslr's Avatar
    bonoboslr is offline Special Member
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    Quote Originally Posted by cmargena View Post
    Do you have any detail on SAN disks, Are they SCSI or SATA?
    We have a mixture of both. For our tier 1 (primary) storage, we using drives that are as fast as possible. But in saying that, we have so many 10k sata disks, that my testing showed that the performance of our secondary storage is actually better than the primary (or very close to it).

  2. #22
    drwho18 is offline Senior Member
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    Can you quantify the performance of the 10k sata drives? I've installed mine, and I can hit IO bottlenecks. I only have 8000 accounts, and am running on a single server, with a software raid10 4/7200 rpm WD500's, NCQ. Dual dual-core, each core barely utilized, memory is fine, not running antispam/virus, I note occasional IO bottlenecks. I'm running DRBD to a secondary server as well.

    Wondering if moving to 4 Velociraptors would get me by until some of the new drive tech comes along.

  3. #23
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    The number of accounts is not the point here.

    The point is the number of incoming (and outgoing) mails, if indexing is enabled (or not), the number of concurrent users and the way the users connect (ZWC vs pop vs imap).

    Comparing the storage usage means comparing all of this...

  4. #24
    bonoboslr's Avatar
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    Are you 100% antivirus & antispam are not running? They are I/O monsters. POP3 is also a hog for disk I/O and as Klug has rightly mentioned - indexing. Remember in my instance we had large, large numbers of disks on a SAN, striping across many.

  5. #25
    Jesster's Avatar
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    Quote Originally Posted by drwho18 View Post
    I'm running DRBD to a secondary server as well.
    This may also lead to your IO slow performance (depending on DRBD "protocol") - Can you do a test without DRBD syncing?

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