RAID a strip size
Pavel Kankovsky
peak na argo.troja.mff.cuni.cz
Pátek Listopad 8 09:32:55 CET 2002
On Thu, 7 Nov 2002, Dalibor Toman wrote:
> Podle experimentu se zda, ze je pri cteni kratsich bloku vyhodnejsi
> snizit stripsize (cteni/zapis se rozlozi na vice disku). Bohuzel
> netusim jak pristupuje k disku postgres.
Driver pro Adaptecy (a i nektere dalsi drivery) pisou ve svem
/proc/scsi/... statistiku operaci podle delky, napr.:
(scsi0:0:0:0)
Device using Wide/Sync transfers at 160.0 MByte/sec, offset 31
Transinfo settings: current(9/31/1/2), goal(9/127/1/2), user(9/127/1/2)
Total transfers 2691637 (255673 reads and 2435964 writes)
< 2K 2K+ 4K+ 8K+ 16K+ 32K+ 64K+ 128K+
Reads: 8794 361 191152 25040 14729 6865 8732 0
Writes: 1149306 171419 790439 258574 17878 9368 38980 0
Mozna ze podobnou vec umi i pouzivany driver. (Nebo to do nej lze dopsat
<g>.)
--Pavel Kankovsky aka Peak
"Welcome to the Czech Republic. Bring your own lifeboats."
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