MSA1000 Slow Performance

[matthew robey]

Hi,

MSA1000 running f/w 4.48 in active/passive configuration.

When creating a 6x72gb Raid 5 set, the
"Parity Init" is taking 5 hours ! Surely this cannot be right.
Controller is doing nothing, other than initialising this raid set.

Any advice/comments ?

Thanks,

Matt

PS Got Forum emails again for a couple of days, and now they've stopped again. What's going on ?

[Jefferson Humber]

Matt,

Is your cache enabled ?

Jeff

[Glenn N Wuenstel]

Matt,
What is the rebuild priority? You should se that to medium. Do you have other arrays configured? With the rebuild at low surface scan could be impacting the init.

Glenn

[matthew robey]

Cache is enabled (256 Read, 256 Write).
Rebuild priority is set to HIGH.

Matt

[John Kufrovich]

Be glad you didn't use 300G drives.

PI can be accomplished in two ways and both take approximately the same amount of time.

1). Zero out the drives or LUN. You would have to write 0's to each drive.

2). Read each strip, calculate parity, then write the Parity strip.

It is a little more complicated than what I stated but you should get the jest. The MSA follows procedure 2.

While PI is running, you can still perform I/O, your performance will be degraded.

[matthew robey]

I logged a call with HP and was told that the
Parity Init can take up to TWO DAYS depending on the controller activity.

The disk (raid set) is usable during this time although performance is slightly degraded.

Matt

[matthew robey]

Thread closed.