- Original Message
> From: Ross Walker
> To: CentOS mailing list
> Cc: CentOS mailing list
> Sent: Thu, February 11, 2010 12:30:43 PM
> Subject: Re: [CentOS] disk I/O problems with LSI Logic RAID controller
>
> On Feb 11, 2010, at 2:46 AM, Andrzej Szymanski
On Feb 11, 2010, at 2:46 AM, Andrzej Szymanski
wrote:
> On 2010-02-09 18:15, Fernando Gleiser wrote:
>> Every time we try to copy some large file to the storage-based file
>> system, the disk utilization see-saws up to 100% to several seconds
>> of inactivity, to climb up again to 100% and
On 2010-02-09 18:15, Fernando Gleiser wrote:
> Every time we try to copy some large file to the storage-based file system,
> the disk utilization see-saws up to 100% to several seconds of inactivity, to
> climb up again to 100% and so forth.
> Here are a snip from the iostat -kx 1:
>
> Device:
On Tue, Feb 9, 2010 at 4:33 PM, Fernando Gleiser wrote:
> - Original Message
>
>> From: nate
>>
>> Not sure I know what the issue is but telling us how many disks,
>> what the RPM of the disks are, and what level of RAID would probably
>> help.
>>
>> It sounds like perhaps you have a bun
nate wrote:
> Perhaps RAID 6, as I've never heard of RAID 5 with two parity (two
> parity is dual parity which is RAID 6).
Forgot to mention my own personal preference on my high end SAN at
least is for RAID 5 with a 3:1 parity ratio, or a max of 5:1 or 6:1,
really never higher than that unless a
Fernando Gleiser wrote:
> yes, ita bunch of 12 7k2 RPM disks organized as 1 hot spare, 2 parity disks,
> 9 data disks in a RAID 5 configuration. is 9/2 a "high ratio"?
Perhaps RAID 6, as I've never heard of RAID 5 with two parity (two
parity is dual parity which is RAID 6).
RAID 6 performance ca
- Original Message
> From: nate
>
> Not sure I know what the issue is but telling us how many disks,
> what the RPM of the disks are, and what level of RAID would probably
> help.
>
> It sounds like perhaps you have a bunch of 7200RPM disks in a RAID
> setup where the data:parity ratio
Fernando Gleiser wrote:
> we're having a weird disk I/O problem on a 5.4 server connected to an
> external SAS storage with an LSI logic megaraid sas 1078.
Not sure I know what the issue is but telling us how many disks,
what the RPM of the disks are, and what level of RAID would probably
help.
I
we're having a weird disk I/O problem on a 5.4 server connected to an external
SAS storage with an LSI logic megaraid sas 1078.
The server is used as a samba file server.
Every time we try to copy some large file to the storage-based file system, the
disk utilization see-saws up to 100% to seve
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