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Xserve Raid
Does anyone have a Xserve Raid? What throughput in MB/s are you getting in Raid5?
Thanks
Barti -
9 Replies
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Yeup I have an XSR, about 150 per side if I can remember
Peter
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We have an older xRaid, fully populated (14 250GB disks) running in RAID 50.
Speed is dependent on fullness of the raid.
Normally at say half-full, we can barely do 1080i60 10bit uncompressed captures and playback.
An average write speed using the AJA System Test is between 160-180 MB/s.
An average read speed is usually in the 220-260 MB/s range.We have found anything more than half full is rolling the dice when it comes to capturing HD uncompressed.
hope that helps.
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The most common setup for XServe RAIDs is RAID 50 (Both sides of XRAID get RAIDed in RAAID 5, then striped together in RAID 0). In this setup, you should be getting around 200MB/sec read times. Mine stayed around 206MB/Sec until I hit 60% full and then it drops off significantly. Now using a 4Gb Infortrend drive that sustains about 550MB/sec read times and doesn’t roll off as badly when it fills up.
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Nathan –
I have the same setup – 2 sides (each at raid 5) striped together at raid 0 – and I’m getting about the same speeds – around 200 till you get to around 60% full. Which is very disappointing when compared to the Medea FCR2X which is running on the same fibre channel and gets speeds closer to 300MB/sec for a lot less money.
Herb Sevush
Zebra Productions -
[Nathan Adams] “Now using a 4Gb Infortrend drive that sustains about 550MB/sec read times and doesn’t roll off as badly when it fills up.”
Can you post a link to this system?
We’ve had very poor performance from our RAID with drives bailing out on us left and right at $400 a pop for a 250GB and just barely enough speed to on only half our space. Then there’s the problem of the 24 hour wait while the xRAID rebuilds itself. It usually means we lose 2 days production when a drive goes out. A reseller tells me that the xRAID has been the most reliable of all the systems he’s sold including Medea and others.
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Thanks all, I’m thinking of looking at CalDigit HD Pro as possible storage (about 331 MB/s write and 372 MB/s read) but also interested in the 4Gb Infortrend drive mentioned above.
As the previous post requests please can you give more information or a link?
Thanks
Barti -
You don’t have to spend $400 for a 250GB drive – there’s nothing special about the drives you get from Apple. Just pull out a dead drive and write down the serial# and order it directly over the web – the Hitachi 250 MB drives are under $150.
Herb Sevush
Zebra Productions -
[Herb Sevush] “You don’t have to spend $400 for a 250GB drive – there’s nothing special about the drives you get from Apple.”
We tried that and it didn’t work. Hitachi said there was something special about the firmware that Apple puts on their drive that makes the system think it’s actually a 251GB drive. I could replace the drive with a bigger Hitachi (e.g. 300GB or larger) and it would work. Also, I could replace all the drives in the XRAID with off-the-shelf 250GB (we bought Hitachis at $60ea. BTW). Our VAR said their Apple rep feared what would happen it we did that and then a crashed occured on one of the drives–i.e., there’d be no guarantee the data would be recoverable. We thought that was hype, but couldn’t convince our VAR.
RAID buyers might be interested in this thread and the links within it:
https://forums.creativecow.net/thread/8/947286CalDigit shoppers might be interested in this thread:
https://forums.creativecow.net/thread/8/933316 -
Is anyone here actually running a raid 0 for higher speeds?
In Touch Media Entertainment
Munich, Germany
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