Storage1
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</pre> | </pre> | ||
<pre> | <pre> | ||
| − | Tests: (All outcomes are the result of two tests averaged together) | + | Tests: (All outcomes are the result of two tests averaged together. Tests done with FC5 CD in rescue mode. Raid controller in question is a 3ware 8006 with Raid 1 on 2 80GB drives) |
Storage1 | Storage1 | ||
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dd if=test of=/dev/null <-- 241MB/ | dd if=test of=/dev/null <-- 241MB/ | ||
W/O Exhaust Fans - (3 Raid fans and CPU fans) | W/O Exhaust Fans - (3 Raid fans and CPU fans) | ||
| − | dd if=/dev/zero of=test bs=1024 count=10000000 <-- | + | dd if=/dev/zero of=test bs=1024 count=10000000 <-- 98MB/s |
dd if=test of=/dev/null <-- 223MB/s | dd if=test of=/dev/null <-- 223MB/s | ||
W/ Exhaust Fans - (All fans on) | W/ Exhaust Fans - (All fans on) | ||
| − | dd if=/dev/zero of=test bs=1024 count=10000000 <-- | + | dd if=/dev/zero of=test bs=1024 count=10000000 <-- 81MB/s |
dd if=test of=/dev/null <-- 252MB/s | dd if=test of=/dev/null <-- 252MB/s | ||
With Exhaust fans and Storage 2 powered on. (Its racked below Storage1) | With Exhaust fans and Storage 2 powered on. (Its racked below Storage1) | ||
| − | dd if=/dev/zero of=test bs=1024 count=10000000 <-- | + | dd if=/dev/zero of=test bs=1024 count=10000000 <-- 72MB/s |
dd if=test of=/dev/null <-- 237MB/s | dd if=test of=/dev/null <-- 237MB/s | ||
Revision as of 04:02, 20 December 2006
Concerning the slow raid:
Kyle, We will track this issue under Ticket: #15298. It looks like the most recent storage server purchase you made was under order #S2025934 [SM24266, SM24267] for 2 x K300s. We may have seen the issue you are describing to us before. The internal host drives have a feature where if there is too much vibration in the server the write speeds will slow way down in order to prevent damage to the platters. With these storage servers you would notice this issue if the server rack is vibrating more than usual or if the exhaust fans in the rear of the chassis are causing too much vibration. I would like to target the fans first. If you are able to, please install lm_sensors on one of the storage servers and send us the fan speed output. This will allow us to narrow it down to which version of the exhaust fans your servers have in the rear of the chassis. Thanks in advance, Jonathan McQuistion Silicon Mechanics Support
Tests: (All outcomes are the result of two tests averaged together. Tests done with FC5 CD in rescue mode. Raid controller in question is a 3ware 8006 with Raid 1 on 2 80GB drives) Storage1 W/O Exhaust Fans and no raid fans (Only CPU Fans) dd if=/dev/zero of=test bs=1024 count=10000000 <-- 106MB/s dd if=test of=/dev/null <-- 241MB/ W/O Exhaust Fans - (3 Raid fans and CPU fans) dd if=/dev/zero of=test bs=1024 count=10000000 <-- 98MB/s dd if=test of=/dev/null <-- 223MB/s W/ Exhaust Fans - (All fans on) dd if=/dev/zero of=test bs=1024 count=10000000 <-- 81MB/s dd if=test of=/dev/null <-- 252MB/s With Exhaust fans and Storage 2 powered on. (Its racked below Storage1) dd if=/dev/zero of=test bs=1024 count=10000000 <-- 72MB/s dd if=test of=/dev/null <-- 237MB/s If there is caching taking place, is consistent. (Whatever is cached with the fans off, the same thing is cached with the fans on, and its slower) There are definitely slower writes taking place on this raid controller with more fans. Obviously we cannot function without fans.
