Re: [patch] improve stripe_cache_size documentation
From: dean gaudet <hidden>
Date: 2007-12-30 18:18:29
On Sun, 30 Dec 2007, Thiemo Nagel wrote:
quoted
stripe_cache_size (currently raid5 only)As far as I have understood, it applies to raid6, too.
good point... and raid4. here's an updated patch. -dean Signed-off-by: dean gaudet <redacted> Index: linux/Documentation/md.txt ===================================================================
--- linux.orig/Documentation/md.txt 2007-12-29 13:01:25.000000000 -0800
+++ linux/Documentation/md.txt 2007-12-30 10:16:58.000000000 -0800@@ -435,8 +435,14 @@ These currently include - stripe_cache_size (currently raid5 only) + stripe_cache_size (raid4, raid5 and raid6) number of entries in the stripe cache. This is writable, but there are upper and lower limits (32768, 16). Default is 128. - strip_cache_active (currently raid5 only) + + The stripe cache memory is locked down and not available for other uses. + The total size of the stripe cache is determined by this formula: + + PAGE_SIZE * raid_disks * stripe_cache_size + + strip_cache_active (raid4, raid5 and raid6) number of active entries in the stripe cache