Re: [zfs-discuss] ZFS is very slow in our test, when the capacity is high

[Thomas Liesner]

Hi,

did you read the following? 
http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide

 Currently, pool performance can degrade when a pool is very full and
 filesystems are updated frequently, such as on a busy mail server.
 Under these circumstances, keep pool space under 80% utilization
 to maintain pool performance.

I wonder if defining a zfs quota of roughly 80% of the whole pool capacity 
would help to keep performance up. Users always use all the space available.

Regards,
Tom
 
 
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Re: [zfs-discuss] ZFS is very slow in our test, when the capacity is high

[LI Xin]

eSX wrote:
 We are tesing ZFS in OpenSolairs, write TBs data to ZFS, But when the
 capacity is close to 90%, ZFS went into slowly. We do ls, rm, and write
 something, those operation is so terrible. for example, we do ls in a
 Directory which have about 4000 Directories, the time is about 5-10s!
 we've checked the CPU, memory(and swap), IO, all those are normal and
 idle. So is there any specialty in ZFS when capacity is high, like UFS?
 thanks.

It's insane to exhaust every bits in almost *any* file system IMHO,
because when this happens you end up with a lot of fragments (this will
affect ZFS more than UFS, as the difference in disk layout), which will
just hurt performance because the increased disk seek requests.

Cheers,
-- 
Xin LI [EMAIL PROTECTED]  http://www.delphij.net/
FreeBSD - The Power to Serve!



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