Hard disk write performance very slow


 
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Operating Systems Solaris Hard disk write performance very slow
# 8  
Old 12-02-2010
if you have parallel reads and/or writes on d7, d8 and d9 they can get slow because they are all on the same physical disks. as d110 and d120 are also... so you have 5 metadevices on 4 physical disks which are in a raid5. i don't know what kind of traffic is on your system but using more devices on different controllers would/could be an enhancement for the i/o performance of your filesystems.
# 9  
Old 12-02-2010
I'm not familiar offhand with the output from "iostat -Xtc 5 2" - I usually run something like "iostat -sndzx 2" to get IO to actual physical LUNs, but assuming that sd5, sd6, sd7, and sd8 correspond to the hard drives in d7, d8, and d9, they're sustaining 60 or 70 IO ops/sec and showing about 25% busy in the second output set from the iostat command.

What kind of drives are they? What kind of IO are you doing? Random? Large streaming reads/writes?
# 10  
Old 12-13-2010
Hi Duke,

At last i got a mail from Sun saying that we need to increase the interlace size value for this RAID 5 volume .

But already a RAID 5 volume is present with less interlace size.

Kindly tell me the steps that we need to take before recreating the interlace and recreate RAID 5.

Thanks...

---------- Post updated at 11:47 PM ---------- Previous update was at 11:33 PM ----------

I need to increase the interlace size , according to SUN. How can we find out the device where we have issues and also pl tell me the precautions that we need to take before recreating raid5 and resizing interlace size
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