Async write errors on busy Lvol/Filesystem

Todd McDaniel_1 — Fri, 20 Feb 2004 10:52:15 GMT

Ladies and germs,

I have a question about Async write errors. On one Lvol/FS, I have had 712 write errors on one particular disk since my last reboot on January 17, 2004.

The disk appears to be fine, There are 4 disks in the Lvol but it is not mirrored nor striped, although the LUNS are on EMC and are h/w mirrored.

My question is this.

Does the number of Async write errors have any extra wear on the disk b/c of the sheer volume of writes or is that merely a function of the software portion, I mean that it is more a function of the actual data crossing the fiber/switch/EMCframe to the disk ?

Should I consider this a hot disk? ie. that it is being hit much more often than the other 3 disks on the LVOL?

I think I will mention it to my Performance management group or perhaps my EMC folks as well, just to get their opinion as well.

Thanks.

Re: Async write errors on busy Lvol/Filesystem

Steven E. Protter — Fri, 20 Feb 2004 10:55:54 GMT

Is the I/O really high on that disk?

The write error issue could be due to stress.

Especially if the disk is solid.

You might want to collect form performance data, looking for I/O issues.

Also, you might want to do some measurement on the array.

SEP

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Async write errors on busy Lvol/Filesystem

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