On Sat, Feb 01, 2003 at 04:20:46PM -0500, Martin K. Petersen wrote:
"Christian" == Christian Guggenberger
<Christian.Guggenberger@xxxxxxxxxxxxxxxxxxxxxxxx> writes:
Christian> I'm going to set up a new 1.7 TB HW Raid 5 next week. RAID
Christian> 5 contains 11 disks, Stripe Unit should be (according to
Christian> the manual) 128k. so my mkfs.xfs options will be
Christian> sunit=256, swidth=2560 for the data section, won't they?
Yup.
Christian> I will definitly use internal log, so I'd like to ask, if I
Christian> should use logversion 2, and what sunit and swidth values I
Christian> should use here? I guess the same as for the data
Christian> section???
128KB log alignment seems a bit of an overkill.
Does your controller state which chunk size it uses internally? Most
controllers use 4-16KB blocks for RAID5. So try aligning your log to
values in that neighbourhood.
thanks for your quick answer!
The only Documentation about stripe or chunk size I got from the vendor is,
to use 32k chunk size for random read/write optimaziation or 128k chunk for
sequentiell read/write optimaziation... No mention about what the contoller
does internally!
so I will stay with logversion 1 and sunit, switdh arguments for data
section as mentioned above.
@Walt, yes its an hardware Raid5
thanks
Christian