From: Kevin Beauchamp (Kevin.Beauchamp@ualberta.ca)
Date: Mon Mar 08 2004 - 10:30:22 EST
Thanks to "Alan Rollow - Dr. File System's Home for Wayward Inodes."
<alan@desdra.cxo.cpqcorp.net> and Benjamin Ingwersen
<benjamin@frontierus.com> for feedback regarding the largest drive that can
be attached to either an AlphaServer 1000 or 1000A.
Here's the summary of the replies:
=====
1 TB is the largest drive that can be used by that
version of the operating system.
128 MB is the largest drive supported by UFS (*).
I think the AdvFS limit is a bit under the 1 TB
device size limit for the operating system.
The biggest drive you can get for the internal
StorageWorks enclosure is 36 GB. This is also
the largest drive available in the SBB carrier.
The largest drive available in the Universal
carrier, may be over 140 GB. SCSI connected
RAIDs can be much larger.
The SCSI adapter isn't the relevant part for any
reasonably sized device. The packaging is going
to be the real limiting factor. The operating system
limit is based on the number of 512 byte sectors
that can be counted with a 32 bit signed integer;
2,147,483,647 (1 TB - 1 sector). The SCSI Read
Capacity command used by the operating system is
probably limited to a 32 bit integer as well.
(*) I believe this was a testing limit. I tried
a TB sized device on an early V5 release with UFS
and it had trouble keeping the file system consistent.
I didn't test extensively, but it started to behave
reasonably under 700 GB. Over 128 GB with UFS and
I would test more extensively if the file system
were going to be used for real data.
=====
Pretty sure that 18.2Gb is the largest supported by the SCSI cards which
are supported for that system.
=====
Kevin B.
This archive was generated by hypermail 2.1.7 : Sat Apr 12 2008 - 10:49:53 EDT