From: vlad f halilow (mlist@ratel.ru)
Date: Tue Nov 21 2006 - 15:44:55 EST
Hi there. Anybody using QFS in SRSS network? I want to maintaining users
home using SAN instead NFS-HA, so need shared filesystem and QFS looks
right way. But have question about technical details:
1) Metadata server. What timing for failover metadata server, any
recomendation etc? QFS docs say nothing about separate server for
maintaing metadata, and i want to use one sunray server as metadata and
another srss server for potential metadata server. But current sunray
network not a very stable by various reason. So i need to reboot sunray
servers time to time, and i am afraid about some out-of-service for
entire network (by metadata server crash for example). Is i
understanding right, that after metadata server crashed, users got
lockdown until metadata srv failover? about 5 minits, right?
2) Not a QFS specific. Just reading solaris whitepaper about QFS and
found next note:
------------
Sun StorEdge QFS software allows any DAU size from 4 to 65,528 KB. This
allows the file
system to match the block size or I/O to the optimal DAU size for each
disk in the file system. For
example, if the RAID5 array is configured with three data disks and one
parity disk, and the stripe
width is set to 16 KB, the block size should be set to 48 KB (3 x 16 KB
= 48 KB) or a multiple of
48 KB. This helps ensure that the 16 KB blocks on the disk are written
contiguously, minimizing
performance loss that occurs when the heads must reposition to a
different area of the disk
-----------
As my mind, this rule applicable not only for QFS but for ufs too. I
have some solaris host with same software raid5 config, and interleave
128k. So, i must creating new fs with 128x3=384k, but newfs support 8192
bytes maximum block size.. :-/ can anyone comment this thing?
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