Thread (7 messages) 7 messages, 5 authors, 2013-12-26

Re: md-RAID5/6 stripe_cache_size default value vs performance vs memory footprint

From: Stan Hoeppner <hidden>
Date: 2013-12-22 01:41:37
Also in: linux-xfs

On 12/21/2013 5:18 AM, Stan Hoeppner wrote:
...
For example, I assisted a user with 5x Intel SSDs back in January and
his system required 4096, or 80MB of RAM for stripe cache, to reach
maximum write throughput of the devices.  This yielded 600MB/s or 60%
greater throughput than 2048, or 40MB RAM for cache.  In his case 60MB
more RAM than the default was well worth the increase as the machine was
an iSCSI target server with 8GB RAM.
Correction here.  I said above that 80MB was 60MB greater than the
default for his 5 drives.  This should have said 75MB greater than the
default which is 1MB per member device, or 5MB for 5 drives.

-- 
Stan

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