|To:||Greg Freemyer <freemyer@xxxxxxxxxxxxxxxxx>, xfs mailing list <linux-xfs@xxxxxxxxxxx>|
|Subject:||Re: 3ware - Itanium compatible drivers?|
|From:||Seth Mos <knuffie@xxxxxxxxx>|
|Date:||Thu, 30 Jan 2003 19:09:22 +0100|
At 11:27 30-1-2003 -0500, Greg Freemyer wrote:
Or have any thoughts about a pure software Raid?
I know the md driver can do Raid 1, can it do Raid 5?
Yes, for the best performance you should at least use the version 2 log(journal) with a md raid5 or even better, use a external logdevice.
A raid 1 system disk would be a good candidate. Note that putting the external logdevice on a different drive _can_ result in a performance bottleneck when you have more concurrent metadata throughput (not data!) then the external logdevice can shove.
My suggestion, put 2 15K rpm scsi disks in a raid 1 config (may be software raid) for the root and boot drive and put the external logdevice on here as well. Then use the rest of the disks for a software raid 5 container with about 4-5 disks per scsi channel (if you use scsi).
The faster logdevice disks can do a lot of IO per second which will help a busy filesystem.
If 3ware does deliver cards for IA64 the external log device issue is moot.
-- Seth It might just be your lucky day, if you only knew.
|<Prev in Thread]||Current Thread||[Next in Thread>|
|Previous by Date:||Re: 3ware - Itanium compatible drivers?, darren . miller|
|Next by Date:||TAKE - fix some bio intialization code, Steve Lord|
|Previous by Thread:||Re: 3ware - Itanium compatible drivers?, Joshua Baker-LePain|
|Next by Thread:||Re: 3ware - Itanium compatible drivers?, darren . miller|
|Indexes:||[Date] [Thread] [Top] [All Lists]|