Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Tue, 24 Jul 2012 14:08:29 +0200 Phil Stricker wrote: > Hi! > > One Problem is solved: > The extremely bad read-performance in the VM is gone away after the > downgrade from DRBD 8.4.1 to 8.3.13!! > Ah yes, 8.4... ^o^ > There is just one problem left: > The setup "xenserver <-> LSI9260 <-> 8x SSD" is too slow! I can just get > about 450 MB/s - no matter, if i set it up as an Raid 10 or Raid 0! > This is xenserver directly talking to the RAID device, not DRBD? > Did you ever see something like that? Not using xenserver, but that now really looks like a xenserver limitation. This is what I get on an Adaptec 51645 with an 8 disk RAID10 of 2TB SATA Hitachi drives (bonnie++): --- 3.2, 8disk R10, ext4, 1G journal Version 1.96 ------Sequential Output------ --Sequential Input- --Random- Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP mb13 64G 529030 55 270813 33 1072430 63 642.0 50 --- So the writes on this setup with inferior drives are faster than your reads and reads are twice as fast... Regards, Christian -- Christian Balzer Network/Systems Engineer chibi at gol.com Global OnLine Japan/Fusion Communications http://www.gol.com/