On Monday June 27, [email protected] wrote:
> Moin.
>
> The machine:
>
> amd64, 2G mem, 4 SATA disks on SiI 3114 [SATALink/SATARaid] Serial ATA
> Controller, configured as md raid5/raid1, using [cfq-scheduler], running
> 2.6.12-rc6 (application postgresql)
>
> The story:
>
> This morning the machine was very slow, first check shows that the machine
> swaps and all disk i/o are very slow.
>
> Looking further slabtop shows
>
> Active / Total Objects (% used) : 19821561 / 19828316 (100.0%)
> Active / Total Slabs (% used) : 369737 / 369739 (100.0%)
> Active / Total Caches (% used) : 80 / 120 (66.7%)
> Active / Total Size (% used) : 1415795.50K / 1416586.19K (99.9%)
> Minimum / Average / Maximum Object : 0.02K / 0.07K / 128.00K
>
> OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
> 9865575 9864690 99% 0.02K 43847 225 175388K biovec-1
> 9865254 9864654 99% 0.12K 318234 31 1272936K bio
raid5 never allocates from these slabs, so this cannot be a raid5
problem.
raid1 does, and you mention in the intro that raid1 might be involved,
but there are now more details...
Could you say a little bit more about your setup.. How are each of
raid1 and raid5 used. Was there any error on a drive involved in raid1?
I just checked my test machine (running 2.6.12-rc3-mm3) and it had a
really large number of bio and biovec-1 in use too (and it's been
sitting fairly idle for several days).
I've quickly reviewed the raid1 code and I cannot see a bio leak
(though that doesn't mean there isn't one..)
If anyone else has a large 'bio' slab, please report the configuration
(kernel, is md in use, etc).
NeilBrown
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