Is it really reasonable that it should take almost 48 hours to make
Anders Norrbring wrote: the initial sync of a 2-disk RAID-1 that is 200Gb in size?
The disks are of course a pair of old ATA-133 P-ATA disks, but it still seems like 40 hours too many? I have never made a software RAID before, only hardware, so I really don't know..
Anders.
It sort of depends on the size of the disks.
If this is the first sync it can take quite a while, but as long as one of the disks is empty, when the sync started there is no ambiguity as to which is more current, etc, and you can run right thru the sync.
(That is you can still use the array while it is syncing without significantly extending the sync time).
Those who make this out to be a problem really don't understand that this is meant to be a background process which does not hinder your active use of the array.
Further, there is a full bandwidth option for the sync, especially useful for the first build. After that, use of the array is more important than getting them synced immediately.
As Philip mentioned, one drive per channel in any given array is the rule of thumb with ATA/IDE or SCSI drives.
Thanks to you all. Yes, naturally the 2 disks are on separate channels.. ;-) And I actually don't mind the initial sync time, I was just really surprised by the fact that it estimates 47.6 hours to make the sync.. As I mentioned, I've never set up a s/w RAID before, I've always been using h/w before.. Looking back at the old Compaq days with SCSI-2 drives, a RAID-5 with 12 disks very rarely took more than an hour to build, so 48 hours feels like "eternity" with 2 not-that-old disks. I need to look more into the mdadm utility, I actually just used the defaults to create the array, but of course there are tuning options, I just didn't expect that the result would be this.. ;-) It's really not a big issue for me, this is only a very temporary setup.. I was just surprised... Anders. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org