On Sat, Jan 06, 2007 at 11:33:32AM +0200, edgarz wrote:
> Jacob Yocom-Piatt wrote:
> >edgarz wrote:
> >>edgarz wrote:
> >>>Hi all!
> >>>Installed fresh CURRENT on intel NH/SR1475NH1, with Intel RAID SRCS16
> >>>(SATA), running RAID5.
> >>>All hardware is recognised, but i have a problems with slow raid
> >>>performance.
> >>>maximum what i saw in iostat was a 8.2MB/s
> >>>
> >>>ami0 at pci2 dev 1 function 0 "Symbios Logic MegaRAID" rev 0x01: irq 9
> >>>ami0: Intel RAID SRCS16, 64b/lhc, FW 713N, BIOS vG401, 64MB RAM
> >>>ami0: 1 channels, 0 FC loops, 1 logical drives
> >>>scsibus0 at ami0: 40 targets
> >>>sd0 at scsibus0 targ 0 lun 0: <AMI, Host drive #00, > SCSI2 0/direct
> >>>fixed
> >>>sd0: 312804MB, 312804 cyl, 64 head, 32 sec, 512 bytes/sec, 640622592
> >>>sec total
> >>>scsibus1 at ami0: 16 targets
> >
> >perhaps this is a with/without battery problem? just a guess...
> battery problem??
Many RAID systems rely on a battery to power their memory and such in
case of a power cut; this has the large advantage that the RAID card
can make full use of its buffers, confident that it can always get the
disks in a consistent state before it loses power.
Without, the card usually disables all cache, which makes it very slow.
Joachim
