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That's valuable information indeed. Since migrating from Windows to |
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Gentoo I have had to abandon an old PATA RAID 5 card because its Linux |
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drivers haven't been maintained in years. I had thought about going the |
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3Ware route, so I'm glad to hear about your experiences with their |
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cards. I guess I have some more homework to do. Thanks for the heads-up! |
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|
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Joshua Hoblitt wrote: |
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|
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>I have a large number (more then a dozen) 3Ware 8500 and 9500 cards. |
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>The majority of these are 12-port SATA cards with RAID 5 volumes on |
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>them. |
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> |
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>Three quick observations: |
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> |
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>* Software RAID 5 on Linux WILL NOT remap bad blocks/sectors like a |
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>hardware RAID controller. If you care about your data, software RAID |
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>simply isn't an option. |
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> |
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>* The RAID 5 performance of 3Ware controllers is terrible. The 9500 |
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>series cards can push 50-55MB/s with xfs and in the neighborhood of |
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>45MB/s with ext3 (with an enlarged journal, etc.) for sequential writes, |
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>random I/O is even worse. The 8500 cards are about 10% slower compared |
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>to the 9500 once you fill up the on-card cache. |
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> |
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>* Neither xfs or ext3 are reliable on volumes greater then 2TB. Nor can |
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>fdisk even partition them (but lvm2 can handle them). |
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> |
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>Cheers, |
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> |
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>-J |
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> |
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> |
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-- |
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