elevator question
hello list,
in the xfs faq i read elevator=noop is best when using ssd.
i have the gentoo system on a ssd, but the larger data storage partition on softraid with some sata disks. is elevator=noop in this combo still best?
thx for any cunstructive answer
marko
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Quoted 10 lines · On Mon, Mar 17, 2014 at 4:35 PM, Marko Weber|8000 <[email protected]> wrote:
hello list,
in the xfs faq i read elevator=noop is best when using ssd.
i have the gentoo system on a ssd, but the larger data storage partition on softraid with some sata disks.
is elevator=noop in this combo still best?thx for any cunstructive answer
marko
noop and deadline are best for SSDs. deadline is best for spinning disks with XFS, especially in RAID. Stay away from CFQ as it kills parallelism in XFS
Quoted 14 lines
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Am 2014-03-17 16:39, schrieb Grozdan:
Quoted 8 lines · On Mon, Mar 17, 2014 at 4:35 PM, Marko Weber|8000 <[email protected]> wrote:
Quoted 7 lines
hello list,
in the xfs faq i read elevator=noop is best when using ssd.
i have the gentoo system on a ssd, but the larger data storage partition on softraid with some sata disks.
is elevator=noop in this combo still best?
Quoted 7 lines
Quoted 3 lines
thx for any cunstructive answer
marko
noop and deadline are best for SSDs. deadline is best for spinning disks with XFS, especially in RAID. Stay away from CFQ as it kills parallelism in XFS
thx grozdan,
but what, if i have mixed setup in a server ssd + sata ??
marko
Quoted 7 lines
Quoted 7 lines
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Marko,
I haven't done this myself, so use at your own risk, but from the archlinux wiki, there's an example of using udev to set one scheduler for non-rotational disks and another for rotational, which sounds like a good general solution for what you're looking for here:
Cheers,
-Shaun
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Marko Weber|8000
Sent: Monday, March 17, 2014 12:26 PM
To: Xfs
Subject: Re: elevator question
Am 2014-03-17 16:39, schrieb Grozdan:
Quoted 9 lines
Quoted 7 lines · On Mon, Mar 17, 2014 at 4:35 PM, Marko Weber|8000 <[email protected]> wrote:
hello list,
in the xfs faq i read elevator=noop is best when using ssd. i have the gentoo system on a ssd, but the larger data storage partition on softraid with some sata disks.
is elevator=noop in this combo still best?
Quoted 7 lines
Quoted 3 lines
thx for any cunstructive answer
marko
noop and deadline are best for SSDs. deadline is best for spinning disks with XFS, especially in RAID. Stay away from CFQ as it kills parallelism in XFS
thx grozdan,
but what, if i have mixed setup in a server ssd + sata ??
marko
Quoted 7 lines
Quoted 7 lines
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Le Mon, 17 Mar 2014 18:25:32 +0100
Marko Weber|8000 <[email protected]> écrivait:
Quoted 3 lines
thx grozdan,
but what, if i have mixed setup in a server ssd + sata ??
Very easy, you can set the io scheduler for each device separately at will:
echo 'noop' > /sys/block/sda/queue/scheduler
echo 'deadline' > /sys/block/sdb/queue/scheduler
You can put that in some startup script like /etc/rc.local.
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http://oss.sgi.com/mailman/listinfo/xfsQuoted 6 lines · On 3/17/2014 10:35 AM, Marko Weber|8000 wrote:
hello list,
in the xfs faq i read elevator=noop is best when using ssd. i have the gentoo system on a ssd, but the larger data storage partition on softraid with some sata disks.
is elevator=noop in this combo still best?
The elevator is per physical device. For SSD use noop. But with your setup is doesn't matter as md/RAID will run at rust speed.
A better solution is to remove the SSD partition from the md/RAID array, reshape/shrink/rebuild the array to make it happy, whatever is necessary after removing the SSD partition.
Now configure the SSD partition as bcache and enable writeback policy. This will increase the performance of the rust array to SSD level for writes, and for reads after frequently accessed data is cached in your SSD.
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Le Mon, 17 Mar 2014 17:51:02 -0500 vous écriviez:
Quoted 4 lines
Now configure the SSD partition as bcache and enable writeback policy. This will increase the performance of the rust array to SSD level for writes, and for reads after frequently accessed data is cached in your SSD.
+1 :) you may also try enhanceIO, flashcache...
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Am 2014-03-18 10:26, schrieb Emmanuel Florac:
Quoted 8 lines
Le Mon, 17 Mar 2014 17:51:02 -0500 vous écriviez:
Quoted 4 lines
Now configure the SSD partition as bcache and enable writeback policy. This will increase the performance of the rust array to SSD level for writes, and for reads after frequently accessed data is cached in your SSD.
+1 :) you may also try enhanceIO, flashcache...
i am barely new to this issue. What would you xfs guys recommend me? i prefer things i can do with kernel, so its dm-cache? bcache?
the raid is an raid5 with 3 disks at moment. xfs filesystem. do i have to format it again and set special things?
i use nobarrier at moment,
any hints or links or guides or even tipps from you directly would be great,
thanks
marko
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Le Tue, 18 Mar 2014 11:18:04 +0100
Marko Weber|8000 <[email protected]> écrivait:
Quoted 2 lines
i am barely new to this issue. What would you xfs guys recommend me? i prefer things i can do with kernel, so its dm-cache? bcache?
The easier will be bcache because it comes included with the kernel.
Quoted 2 lines
the raid is an raid5 with 3 disks at moment. xfs filesystem. do i have to format it again and set special things?
No, only the cache itself must be reformatted.
Quoted 1 line
i use nobarrier at moment,
if you're not using a hardware RAID controller with a battery-backed or flash-based cache, it may be risky. Depends mostly on your write activity and power supply stability, though.
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