* Raid chunksize...
@ 2003-05-28 10:34 Matt
2003-05-28 22:55 ` Tom Vier
0 siblings, 1 reply; 4+ messages in thread
From: Matt @ 2003-05-28 10:34 UTC (permalink / raw)
To: linux-raid
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Hello,
I currently have a software raid0 setup with this configuration
raiddev /dev/md0
raid-level 0
nr-raid-disks 2
nr-spare-disks 0
persistent-superblock 1
chunk-size 4
device /dev/hda2
raid-disk 0
device /dev/hdc2
raid-disk 1
Both drives are 80 gig .. so the total comes out to 160 gig w/ raid0 .. Now is
a chunksize of 4k to small (??), or is it optimal (??). Also I'am curios is
there anyway to change the chunksize w/o lossing the raid array and the
contents inside that array ?
Thanks,
Matt
- - Also Iam not on the list , so any replies please CC to me .. Thanks
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Raid chunksize...
2003-05-28 10:34 Raid chunksize Matt
@ 2003-05-28 22:55 ` Tom Vier
2003-05-29 0:40 ` Matt
0 siblings, 1 reply; 4+ messages in thread
From: Tom Vier @ 2003-05-28 22:55 UTC (permalink / raw)
To: Matt; +Cc: linux-raid
On Wed, May 28, 2003 at 03:34:49AM -0700, Matt wrote:
> raid-level 0
> chunk-size 4
>
> Both drives are 80 gig .. so the total comes out to 160 gig w/ raid0 .. Now is
> a chunksize of 4k to small (??), or is it optimal (??). Also I'am curios is
yes, i definetly think that's too small. try 16, 32, and 64. i'm using 32 w/
reiserfs. the only way to really find the optimal size, is of course to try
different sizes timing what you typically use the drives for.
> there anyway to change the chunksize w/o lossing the raid array and the
> contents inside that array ?
nope.
--
Tom Vier <tmv@comcast.net>
DSA Key ID 0xE6CB97DA
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Raid chunksize...
2003-05-28 22:55 ` Tom Vier
@ 2003-05-29 0:40 ` Matt
2003-05-29 2:01 ` Tom Vier
0 siblings, 1 reply; 4+ messages in thread
From: Matt @ 2003-05-29 0:40 UTC (permalink / raw)
To: Tom Vier; +Cc: linux-raid
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what about using raidreconf , to reconfigure the array ??
Matt
On Wednesday 28 May 2003 03:55 pm, you wrote:
> On Wed, May 28, 2003 at 03:34:49AM -0700, Matt wrote:
> > raid-level 0
> > chunk-size 4
> >
> > Both drives are 80 gig .. so the total comes out to 160 gig w/ raid0 ..
> > Now is a chunksize of 4k to small (??), or is it optimal (??). Also I'am
> > curios is
>
> yes, i definetly think that's too small. try 16, 32, and 64. i'm using 32
> w/ reiserfs. the only way to really find the optimal size, is of course to
> try different sizes timing what you typically use the drives for.
>
> > there anyway to change the chunksize w/o lossing the raid array and the
> > contents inside that array ?
>
> nope.
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Raid chunksize...
2003-05-29 0:40 ` Matt
@ 2003-05-29 2:01 ` Tom Vier
0 siblings, 0 replies; 4+ messages in thread
From: Tom Vier @ 2003-05-29 2:01 UTC (permalink / raw)
To: Matt; +Cc: linux-raid
On Wed, May 28, 2003 at 05:40:56PM -0700, Matt wrote:
> what about using raidreconf , to reconfigure the array ??
damn, wish i had know about that a week ago. would have saved me a lot of
time. backup everything and give it a try. let me know if works/doesn't.
--
Tom Vier <tmv@comcast.net>
DSA Key ID 0xE6CB97DA
^ permalink raw reply [flat|nested] 4+ messages in thread
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2003-05-28 10:34 Raid chunksize Matt
2003-05-28 22:55 ` Tom Vier
2003-05-29 0:40 ` Matt
2003-05-29 2:01 ` Tom Vier
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