[CentOS-virt] SATA vs RAID5 vs VMware
rhdyes at gmail.com
Fri Sep 25 05:02:45 UTC 2009
I have been using a 3ware 9690se sata card with raid5. I have been running
Centos using xen and have had no problems.
I wrote my virtual machines to the raw raid5 drive. Its seems to have
worked fine for me.
On Thu, Sep 24, 2009 at 9:18 PM, Philip Gwyn <liste at artware.qc.ca> wrote:
> I have strange behaviour on a server that I can't get a handle on. I have
> reasonably powerful server running VMware server 1.0.4-56528. It has a
> build with mdadm on 5 SATA drives. Masses of ram and 2 XEON CPUs. But it
> Example : fire up vi, press and keep finger on i. After filling 2-3 lines,
> display is stopped for 2-12 seconds. Then they continue. This happens
> even on
> the host OS, at the console.
> Host system running CentOS 5.2 x86-64:
> CPU : 2x Xeon E5430 @ 2.66GHz
> RAM : 24GB
> Mobo : DSBV-DX
> HD : 5 x SATA ST3750330AS 750GB in RAID5
> There are 5 VMs, detailed at http://www.awale.qc.ca/vmware/stj1.txt to
> this mail shorter.
> Seems to me this system should be more then adequate to handle the load.
> This is what vmstat on the host looks like when the server is "unhappy" :
> Spending a lot of time in 'wa', but 'bo' and 'bi' are miniscule.
> The problem seems like a disk problem. I grow to suspect that SATA isn't
> for the big time. I also grow to dislike RAID5.
> Questions :
> - Anyone have a clue or other on how to track down my bottle neck?
> - SATA NCQ is limited to 15 queue depth. Is this per-SATA-port or
> per-SATA-chip? Or does this question make no sense?
> - I realise there are more recent versions of CentOS out. Are there
> items in the changelogs that would affect my problem?
> Thank you for any help,
> CentOS-virt mailing list
> CentOS-virt at centos.org
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