[rescue] Agan, I seek the wisdom of the Collective ...
phil.stracchino at speakeasy.net
Fri Aug 12 15:58:58 CDT 2005
I've been observing how my expanded array is behaving, and I have some
First of all, the hardware: minbar is a U30 with a single 250MHz CPU,
512MB of RAM, 18GB and 36GB internal disks, two framebuffers (basically
unused), two SCSI channels, two hmes (one onboard, one on a
SunSwiftPCI). It's running Solaris 9. The array is twelve IBM
ultrastar 36XP disks spread across two 711 cases, one on each controller.
Now, the behavior: I don't seem to be actually experiencing any data
*loss*. But when the array is being accessed hard, it has a nasty
tendency to fall down and drop offline. Umount it, fsck it, remount it,
and it comes back online just fine, so far with all data intact as far
as I can tell.
Speculation, on which I seek advice and experience: Is my problem
simply that a single USII-250 isn't enough CPU for RAID5 on that
hardware? It's run a six-drive RAID0 for about four years without once
falling down like this.
If this is in fact the case, would moving the array to a dual-400MHz U2
with 2GB RAM help? I've heard it mentioned (but never seen conclusive
documentation) that the Sun metadevice drivers are single-threaded, and
would not benefit appreciably from SMP. Does anyone know if this is
Phil Stracchino phil.stracchino at speakeasy.net
Renaissance Man, Unix generalist, Perl hacker
Mobile: 603-216-7037 Landline: 603-886-3518
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