Iscsi

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iSCSI initiator

Установить open-iscsi

#echo "sys-block/open-iscsi" >> /etc/portage/package.keywords

#emerge sys-block/open-iscsi

Запустить сервис:

#/etc/init.d/iscsid start

Исследовать какие устройства есть на целевой системе

#iscsiadm -m discovery -t st -p 172.16.49.9 172.16.49.9:3260,1 iqn.2009-09.ab.mordred:iSCSI.aradia.disk1

Подключить:

#iscsiadm -m node -T iqn.2009-09.ab.mordred:iSCSI.aradia.disk1 -p 172.16.49.9:3260 -l

В логах

dmesg
<skipped>
[548181.601597] scsi5 : iSCSI Initiator over TCP/IP
[548181.860961] scsi 5:0:0:0: Direct-Access     IET      VIRTUAL-DISK     0    PQ: 0 ANSI: 4
[548181.862415] sd 5:0:0:0: [sde] 12582912 512-byte hardware sectors (6442 MB)
[548181.863446] sd 5:0:0:0: [sde] Write Protect is off
[548181.863452] sd 5:0:0:0: [sde] Mode Sense: 77 00 00 08
[548181.865093] sd 5:0:0:0: [sde] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[548181.872296] sd 5:0:0:0: [sde] 12582912 512-byte hardware sectors (6442 MB)
[548181.881151] sd 5:0:0:0: [sde] Write Protect is off
[548181.881160] sd 5:0:0:0: [sde] Mode Sense: 77 00 00 08
[548181.883161] sd 5:0:0:0: [sde] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[548181.883171]  sde: unknown partition table
[548181.890757] sd 5:0:0:0: [sde] Attached SCSI disk
[548181.890825] sd 5:0:0:0: Attached scsi generic sg4 type 0

#fdisk -l <skipped> Disk /dev/sde: 6442 MB, 6442450944 bytes 199 heads, 62 sectors/track, 1019 cylinders Units = cylinders of 12338 * 512 = 6317056 bytes Disk identifier: 0x00000000 Disk /dev/sde doesn't contain a valid partition table

Проверка работы

После копирования данных на iSCSI диск (в моем случае sde) и монтированя, имею:

iostat  -mtxz /dev/sd? 1
Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await  svctm  %util
sda               0.33    18.63   44.56  166.64     0.18     0.72     8.78     6.59   31.18   4.28  90.37
sdb               0.63   318.09    2.78  246.87     0.05     2.23    18.66     0.34    1.20   1.18  29.38
sdc               0.63   318.99    2.77  245.91     0.05     2.23    18.74     0.83    3.16   1.21  29.97
sdd               0.00    13.26    0.00    0.03     0.00     0.01   807.22     0.17 5101.32  38.49   0.13
sde               0.00     4.07    3.40   11.55     0.01     0.06    10.18     1.72  114.77   1.19   1.78

25.09.2009 10:11:56
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          21.13    0.00   12.29   43.24    0.00   23.34
Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await  svctm  %util
sdb               0.00   166.34    0.00  175.25     0.00     1.37    15.95     1.22    7.07   1.16  20.40
sdc               0.00   166.34    0.00  175.25     0.00     1.36    15.91     1.15    6.59   1.09  19.11
sde               0.00  1031.68    0.00  621.78     0.00     4.74    15.62   135.41  182.22   1.62 100.69

Т.е фактическая нагрузка распределилась по 2-м диска (т.к. часть данных все-таки осталось на первом)

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