Questions regarding proper sizing of AFS servers
Can anyone provide some guidance as to how to properly size an afs server
for effective io ?
Currently, we are using Sun Sparc 10 and Sun Sparc 20 level machines with
fddi interfaces and 3 fast, narrow scsi interfaces (1 built-in plus 2 sbus
scsi channels) with fast, narrow scsi drives. Our newest server has 48 Gb
attached to it (via 4, 4 Gb fast, narrow drives per scsi channel). This
corresponds to 24, 2 Gb vice partitions. With the advent of AFS3.4 which
raises the number of vice partition per server to 255, should we stay we
this configuration or may we increase the number of Gbytes per afs server ?
Please note that we deal with medical images (e.g. several Mbytes per
study) so no amount of storage is ever too litlle.
More specifically,
Should we stay with Sparc 20 level machines or goto higher level machine ?
Should we stay fast, narrow or go to fast, wide differential SCSI drives in
order to optimize performance ?
How many SCSI channels should we put on a server ?
How many GIGabytes and/or disks should we put on a single SCSI channel ( I
know fast, narrow is 7 devices and fast, wide is something like 20 devices;
that is not the question) for effective throughput ?
Thanks
ron levin
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Ronald L. Levin, Sc.D. E-mail: [EMAIL PROTECTED]
BEIP/NCRR
National Institutes of Health
Bldg. 13, Room 3N17
13 South Drive MSC 5766 VOX: (301) 496-4454
Bethesda, MD 20892-5766 FAX: (301) 496-6608
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