On 2 February 2011 15:20, krad wrote:
> On 2 February 2011 12:18, Ivan Voras wrote:
>> On 02/02/2011 05:52, krad wrote:
>>>
>>> Hi All,
>>>
>>> A quick question. Im upgrading my filer at home to have 2x 2tb samsung
>>> F4EG drives. I believe these are 4k drives. I'm intending to use the
>>> gnop trick to get zfs ashift to 12. Will this make my pool unbootable.
>>> I have read a few threads aluding to this.
>>
>> There have been bugs which make such drives unbootable but they have been
>> fixed at least in CURRENT (I haven't tried it).
>>
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>
> where they related to any type of pools in particular as im just mirroring
>
well they are in. i tested with the gnop trick and without. It didnt
seem to make much difference to the performance of the drives.
Certainly not enough for me to worry about. Thinking about it though
as I was addin it to the existing pool as a mirror and then dropping
the old drives out one by one, i was probably forced into the 512k
sectors anyway.
Just finishing up now by filling the pool with urandom, and reading it
back. Its taking a while though.
Do these values seem similar to what others get? Bare in mind I have a
dd of /dev/zero and /dev/urandom running in parallel with a bs=128k
# zpool iostat system 5
capacity operationsbandwidth
pool used avail read write read write
-- - - - - - -
system 1.12T 709G149212 8.48M 15.8M
system 1.12T 708G 2336 2.44K 30.2M
system 1.12T 708G 2541 3.12K 57.0M
system 1.12T 708G 1349 6.05K 32.8M
system 1.12T 708G 1581599 62.9M
system 1.12T 707G 3320 5.46K 30.7M
# iostat -d 5
ad4 ad5 ad6 ad7
KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s
92.50 10 0.93 102.35 245 24.50 91.86 10 0.93 102.02 246 24.49
0.00 0 0.00 106.64 268 27.95 0.00 0 0.00 115.60 413 46.64
0.00 0 0.00 109.72 590 63.19 0.00 0 0.00 103.79 437 44.33
0.00 0 0.00 113.48 349 38.72 0.00 0 0.00 115.70 432 48.84
0.00 0 0.00 106.66 547 57.02 0.00 0 0.00 103.98 461 46.84
0.00 0 0.00 117.52 406 46.62 0.00 0 0.00 117.12 407 46.59
0.00 0 0.00 110.43 565 60.92 0.00 0 0.00 109.64 601 64.37
0.00 0 0.00 119.11 282 32.81 0.00 0 0.00 117.87 254 29.27
# zpool status
pool: system
state: ONLINE
scrub: scrub completed after 2h2m with 0 errors on Sat Feb 5 11:47:21 2011
config:
NAMESTATE READ WRITE CKSUM
system ONLINE 0 0 0
mirrorONLINE 0 0 0
label/red ONLINE 0 0 0
label/blue ONLINE 0 0 0
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