[CentOS] Hard disk recomendation for a software raid 5 array. Does
Linux Software Raid support/interacts well with TLER enabled disks.
alexander.georgiev at gmail.com
Fri Jul 27 12:32:39 UTC 2007
I am building a cheap remote rsync backup server using a software raid
5 array of 4 500GB disks. What I have available on the market is:
1. HITACHI GST Deskstar T7K500 500GB 7200rpm 16MB cache Serial ATA II-300
2. SEAGATE Barracuda 7200.10 with NCQ 500GB 7200rpm 16MB cache Serial ATA II-300
3. Western Digital 500GB SATAII RAID EDITION Caviar SE16 7200rpm 8.9ms
I am tempted to use the Western Digital Raid Edition as it has 5
years of warranty. However I found out that the "Raid Edition" means
that the disk supports TLER - time limited error recovery:
A more profound description can be found here
In summary, the error recovery time of the hard disk is reduced to 8
second. If the hard disk cannot perform the recovery it will report an
error to the RAID controller and delegate the recovery to the
As I intend to use linux software raid on Centos 5, I will not have a
RAID controller to deal with this delegated error, but two cheap I/O
Has anybody used 'raid edition' disks with software raid?
Does anybody know how linux software raid interacts/supports these TLER disks.
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