41 messages in org.freebsd.freebsd-fsSoftware RAID caching? (was: Anyone w...| From | Sent On | Attachments |
|---|---|---|
| Julian Elischer | Mar 17, 2003 12:22 pm | |
| Alfred Perlstein | Mar 17, 2003 12:32 pm | |
| Julian Elischer | Mar 17, 2003 12:39 pm | |
| Julian Elischer | Mar 17, 2003 12:44 pm | |
| Miguel Mendez | Mar 17, 2003 12:59 pm | |
| Bakul Shah | Mar 17, 2003 1:26 pm | |
| Poul-Henning Kamp | Mar 17, 2003 1:38 pm | |
| Julian Elischer | Mar 17, 2003 1:51 pm | |
| Julian Elischer | Mar 17, 2003 1:56 pm | |
| Bakul Shah | Mar 17, 2003 2:04 pm | |
| Bakul Shah | Mar 17, 2003 2:08 pm | |
| Brooks Davis | Mar 17, 2003 2:12 pm | |
| Julian Elischer | Mar 17, 2003 2:25 pm | |
| Jeff Roberson | Mar 17, 2003 2:30 pm | |
| Brad Knowles | Mar 17, 2003 2:39 pm | |
| Greg 'groggy' Lehey | Mar 17, 2003 3:48 pm | |
| Julian Elischer | Mar 17, 2003 4:04 pm | |
| Terry Lambert | Mar 17, 2003 7:41 pm | |
| Terry Lambert | Mar 17, 2003 7:43 pm | |
| Terry Lambert | Mar 17, 2003 7:49 pm | |
| Terry Lambert | Mar 17, 2003 7:58 pm | |
| Jeff Roberson | Mar 17, 2003 8:02 pm | |
| Terry Lambert | Mar 17, 2003 8:31 pm | |
| Kenneth D. Merry | Mar 17, 2003 8:34 pm | |
| Bakul Shah | Mar 17, 2003 8:59 pm | |
| Poul-Henning Kamp | Mar 17, 2003 10:17 pm | |
| Poul-Henning Kamp | Mar 17, 2003 10:23 pm | |
| Greg 'groggy' Lehey | Mar 17, 2003 10:47 pm | |
| Terry Lambert | Mar 17, 2003 10:48 pm | |
| Greg 'groggy' Lehey | Mar 17, 2003 10:53 pm | |
| Peter Wemm | Mar 17, 2003 11:45 pm | |
| Dag-Erling Smørgrav | Mar 18, 2003 1:58 am | |
| Miguel Mendez | Mar 18, 2003 2:08 am | |
| Brad Knowles | Mar 18, 2003 5:59 am | |
| Brad Knowles | Mar 18, 2003 6:04 am | |
| Brad Knowles | Mar 18, 2003 6:25 am | |
| Giorgos Keramidas | Mar 18, 2003 12:12 pm | |
| Brandon D. Valentine | Mar 18, 2003 12:24 pm | |
| Terry Lambert | Mar 18, 2003 2:41 pm | |
| Brad Knowles | Mar 18, 2003 4:15 pm | |
| Terry Lambert | Mar 18, 2003 4:33 pm |
| Subject: | Software RAID caching? (was: Anyone working on fsck?) | |
|---|---|---|
| From: | Greg 'groggy' Lehey (gr...@FreeBSD.org) | |
| Date: | Mar 17, 2003 10:53:17 pm | |
| List: | org.freebsd.freebsd-fs | |
On Monday, 17 March 2003 at 23:02:38 -0500, Jeff Roberson wrote:
On Mon, 17 Mar 2003, Terry Lambert wrote:
Jeff Roberson wrote:
On Mon, 17 Mar 2003, Brooks Davis wrote:
I am still intrested in improvements to fsck since I'm planning to buy several systems with two 1.4TB IDE RAID5 arrays in them soon.
For these types of systems doing a block caching layer with a prefetch that understands how many spindles there are would be a huge benefit.
I call that layer "Vinum" or "RAIDFrame", since that's a job I expect that code to do for me. 8-).
They are not responsible for data caching. Only informing the upper layers how many spindles they have. Software RAID should be a transform only in my opinion. There is no reason to have duplicate block caches in system memory.
Agreed. Vinum doesn't cache. There is one case, though, where it could be argued that it's worthwhile, namely in RAID-[45] parity blocks.
Greg
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