Is XSAN even involved here? Anyways, check your cache settings in
RAID admin. Maybe your caching is turned off for some reason...?
Aaron
On May 23, 2007, at 8:37 PM, Justin wrote:
I had this exact same problem and went round and round replacing
cabling, switches (gigE and FC), even completely rebuilt the
servers and luns and so forth. Finally bought a service contract
from Apple, and after much going around and passing of logs, I got
an email telling me that it was actually a known bug to do with
thread locking per client that they were trying to patch in the
next XSAN release. If I started a bunch of clients at once, the G5
XServe hosting the array would accept data at 30MB/s or more (max I
ever tried was 6 clients at once, it's hard to hit copy on more
than that at once with just one person). There have been two
releases since that time, the first one gave me about 3x the
previous max speed (went to 15MB/s write over gigE from 5MB/s) and
the the more recent XSAN release seems to have gotten me to line
speed, where the limitation is the TX rate from the client.
I don't know how that exactly explains you suddenly inheriting the
problem that I had fixed by updating, but you might check your XSAN
client software version or try reinstalling the latest release.
Justin
On May 21, 2007, at 6:33 PM, abs wrote:
yes we are using raid5. the array is completely full (6 drives on
each array & 1 failover drive).
the write speeds are app independent, no databasing, nothing
fancy, just copying data from a workstation to the server. they
are standards writes via AFP. to write a 15mb file on a gigE
connection takes around 30 seconds. this has been a recent
occurrence.
i gig file that would normally take less than 1 minute takes more
than 3 to 4 minutes. let me know if there is information i am
missing to mention.
sorry about the vagueness.
Trevor Carlson <email@hidden> wrote: List
Are you on RAID 5, remember RAID 5 write slower than reads. Are
you writing to a database? Writes to a database are slower too,
and even slower if writing to tables that arent in RAM, anyway You
need to provide more info, furthermore What is bad performance and
what app ar eyou using. How many drives are in your array, more
details will give you a more detailed answer.
-Trevor
On May 21, 2007, at 11:20 AM, abs wrote:
hello,
we have a xraid connected to a xserve. performance while reading
data from that volume (local as well as over the network) is as
expected but when writing to that volume (over the network) it
goes extremely slow. even when only 1 user is connected to the
share it still goes slow.
xraid admin is not reporting any failed drives or corrupt data.
would someone be able to shed some light as to what maybe
happening? thank you in advance.
cheers,
abs
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