On 15/02/13 16:14, Chris Murphy wrote:
>
> On Feb 14, 2013, at 9:01 PM, Adam Goryachev <mailinglists@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>> Would it be a sequence like this:
>> fdisk /dev/sdb
>> d <- delete the existing partition
>> u <- change units
>> n <- new partition
>> p <- primary
>> 1 <- partition 1
>> 64 <- start sector 64
>> xxx <- end size of partition
>>
>> Will that make it right?
>
> Yes.
OK, so I've started this process, with some unexpected results...
First, this is how the partition looks now:
Disk /dev/sdb: 480 GB, 480101368320 bytes
255 heads, 63 sectors/track, 58369 cylinders, total 937697985 sectors
Units = sectors of 1 * 512 = 512 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 64 931770000 465893001 fd Lnx RAID auto
Warning: Partition 1 does not end on cylinder boundary.
I'm not sure why I get that warning, or if it should worry me... I
suppose I can always extend it a bit bigger if there is any problem with
this?
Initially, I made sure the secondary san was in sync with DRBD, and all
users were logged off the system. I was getting a max of around 50MB/sec
from the RAID resync.
So I shutdown all the windows machines, and this went up to a max of
150MB/sec.
Finally, I stopped DRBD on both the secondary and the primary, so now
the RAID device is completely unused, and it is topping out at 213M/sec...
Personalities : [raid6] [raid5] [raid4]
md1 : active raid5 sdb1[6] sdc1[0] sde1[4] sdf1[5] sdd1[3]
1863535104 blocks super 1.2 level 5, 64k chunk, algorithm 2 [5/4]
[U_UUU]
[=============>.......] recovery = 68.4% (318672880/465883776)
finish=12.3min speed=198212K/sec
bitmap: 3/4 pages [12KB], 65536KB chunk
It was topping out at 200, but I adjusted
/proc/sys/dev/raid/speed_limit_max to 400000
top shows this:
top - 22:06:41 up 1 day, 17:22, 3 users, load average: 1.08, 1.07, 1.06
Tasks: 177 total, 2 running, 175 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.1%us, 0.7%sy, 0.0%ni, 99.1%id, 0.0%wa, 0.0%hi, 0.1%si,
0.0%st
Mem: 7903292k total, 1370132k used, 6533160k free, 131796k buffers
Swap: 3939320k total, 0k used, 3939320k free, 939728k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
425 root 20 0 0 0 0 S 26 0.0 20:27.27 md1_raid5
26236 root 20 0 0 0 0 R 17 0.0 4:22.30 md1_resync
27 root 20 0 0 0 0 S 0 0.0 7:17.68 events/0
also vmstat 5 shows this...
procs -----------memory---------- ---swap-- -----io---- -system--
----cpu----
r b swpd free buff cache si so bi bo in cs us sy
id wa
2 0 0 6532916 131820 939744 0 0 410 121 32 6 0 0
99 0
0 0 0 6533512 131824 939744 0 0 0 13 28280 28796 0
1 99 0
1 0 0 6533300 131832 939744 0 0 0 13 25842 26591 0
1 99 0
1 0 0 6533864 131836 939748 0 0 0 8 30910 31189 0
1 99 0
So it seems CPU is idle, but I'm curious why I don't see somewhat higher
write speeds... I thought I should see something close to 300 or
400MB/sec, or was I just plain wrong?
Just a reminder, these are the Intel 320 series 480G SSD's.
--
Adam Goryachev
Website Managers
www.websitemanagers.com.au
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