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Old 07-09-2010, 07:04 PM   #1
mediv42
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4TB raid 0 (4x1TB) on LSI 1068E gets ...... 14 MB/s read???


My 4 disk raid is far slower than I expected

measured using: # hdparm -tT /dev/sdb1
Timing cached reads: 32356 MB in 2.00 seconds = 16211.66 MB/sec
Timing buffered disk reads: 44 MB in 3.04 seconds = 14.46 MB/sec

system:
CentOS 5.5
supermicro x8da3
2x xeon x5680
48 GB ram
integrated LSI 1068E controller (recognized for some reason as MegaRAID SAS 8208ELP/8208ELP, which is an add-in card similar in functionality to the integrated controller)
1x samsung spinpoint 1TB (system)
4x samsung spinpoint 1TB RAID 0 (workspace) formatted as ext3, single partition

The system seems to recognize the 4TB raid fine, its just slow. any ideas?
 
Old 07-10-2010, 04:06 AM   #2
business_kid
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Raid what?

Anyhow, I would suspect drivers - for m/b chipset, & raid controller.
 
Old 07-14-2010, 06:06 PM   #3
mediv42
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enabled disk write caching in the raid controller - seems to fix the hdparm result.
 
Old 07-14-2010, 06:57 PM   #4
Tinkster
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One might come to the conclusion that you don't value your
data very highly.

RAID-0? Write cache? I assume it's an on-board controller
w/o a battery backed cache?


Cheers,
Tink
 
Old 07-15-2010, 02:31 AM   #5
mediv42
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onboard, no battery backed cache.

but all the data on it should be backed up elsewhere on the network.

Even so, we switched to raid 10 just in case someone accidentally does use this workstation for data storage.
 
Old 07-15-2010, 05:17 AM   #6
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Congratulations - good choice.


Cheers,
Tink
 
  


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