Gentoo Archives: gentoo-user

From: "Stefan G. Weichinger" <lists@×××××.at>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Intel(R) C600 SAS Controller
Date: Tue, 27 May 2014 13:03:34
Message-Id: 53848D1B.1000108@xunil.at
In Reply to: Re: [gentoo-user] Intel(R) C600 SAS Controller by "Stefan G. Weichinger"
1 Am 26.05.2014 21:57, schrieb Stefan G. Weichinger:
2 > Am 26.05.2014 19:47, schrieb Stefan G. Weichinger:
3 >
4 >> But I somehow think the performance is sub-optimal.
5 >
6 > virt-backup is slow as well (using dd and gzip or pigz in my own patched
7 > version). Yes, that LVM stuff again ...
8 >
9 > I run 6 SAS disks and built hardware raids.
10 >
11 > Should I look into the cache settings there?
12 >
13 >
14 > way too slow ...
15
16 I think I have some IO-topic going on ... very likely some mismatch of
17 block sizes ...
18
19 the hw-raid, then LVM, then the snapshot on top of that ... and a
20 filesystem with properties as target ... oh my.
21
22 Chosing noop as IO-scheduler helps a bit but maybe I have to roll back
23 and rebuild one of the HW-RAID-Arrays with a different blocksize.
24
25 Stefan

Replies

Subject Author
Re: [gentoo-user] Intel(R) C600 SAS Controller "Stefan G. Weichinger" <lists@×××××.at>
Re: [gentoo-user] Intel(R) C600 SAS Controller thegeezer <thegeezer@×××××××××.net>