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This is just funny

L

LxMxFxD4

Senior member
4x2TB Hitachi Raid 5 array.

Full format time of 5,589GB: 4 days

Started 8:30pm last night: 18% completed (17 hours in)
 
wow that painful..... imagine how long it'll take to rebuild or expand it!

hmmm..... if I did my math right thats 16.4Mb/s. Makes me wonder what kind of verification process format is using or if the raid controller doesn't like sequential writes.

--update--
Did some searching.... and didn't find what I was looking for, mainly a smarter format or command line options that would do write and verify process in larger chunks as I'm not sure what size format uses by default, ie 512 or 4K IOs, where for a 2TB drive 64K+ IOs might perform better. I was thinking if there was some tuning options it might be faster to restart the process. We've always used smaller scsi drives so I haven't had the pleasure of formatting a 6TB raid array.
 
Last edited:
retnuh said:
wow that painful..... imagine how long it'll take to rebuild or expand it!

hmmm..... if I did my math right thats 16.4Mb/s. Makes me wonder what kind of verification process format is using or if the raid controller doesn't like sequential writes.

--update--
Did some searching.... and didn't find what I was looking for, mainly a smarter format or command line options that would do write and verify process in larger chunks as I'm not sure what size format uses by default, ie 512 or 4K IOs, where for a 2TB drive 64K+ IOs might perform better. I was thinking if there was some tuning options it might be faster to restart the process. We've always used smaller scsi drives so I haven't had the pleasure of formatting a 6TB raid array.
Click to expand...

It's most likely doing them in cluster size chunks which would be 4K on volumes up to 16TB, I believe.
 
Nothinman said:
It's most likely doing them in cluster size chunks which would be 4K on volumes up to 16TB, I believe.
Click to expand...

Sadly I didn't have 4 days to do this. I cancelled it and did a quick format. Russian Roulette on bad sectors I guess.. but so far so good!

4 days.. man, ridiculous.

As for rebuild times.. I would estimat eabout 24 hours. On my old 900GB (4x300GB raid5) array it would take about 6 hours.

We shall see if I get a drive failure!
 
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