Dotaz: Ubuntu/Debian server iSCSI multipath

[HP]

Server i SAN maji 2x 1Gbit sitove karty vyhrazene pro iSCSI provoz.

Chceme pouzit MPIO/multipathing pro zvyseni rychlosti pristup na iSCSI target.

HDparm ukazuje pouze cca 100MB/s.

 

Provedene testy:

1) Windows 2008 R2 jako klient 200MB/s

2) CentOS 5.5 jako klient 200MB/s

 

Nastaveni multipath.conf je shodne pro CentOS 5.5 i Debian 5.0.5/Ubuntu 10.04LTS nicmene pouze pod CentOS to bezi jak ma.

Setkali jste se nekdo s podobnym problemem?

Odpovědi

[dik]

posli konfig. dik

[HP]

Ubuntu 10.04 LTS x86_64

Fujitsu Primergy server. Supermicro SG-I4 (intel quad port gigabit NIC)

Propojeno 3x Gigabit crossover cable

 

Linux test1 2.6.32-24-server #43-Ubuntu SMP Thu Sep 16 16:05:42 UTC 2010 x86_64 GNU/Linux

 

ethtool -i eth2
driver: igb
version: 2.1.0-k2
firmware-version: 1.0-1
bus-info: 0000:03:00.0

 

/etc/multipath.conf

defaults {
udev_dir                /dev
polling_interval        10
selector                "round-robin 0"
path_grouping_policy    multibus
getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
prio_callout            "/bin/true"
path_checker            tur
rr_min_io               4
rr_weight               uniform
failback                immediate
no_path_retry           12
user_friendly_names     yes
}

 

multipath -ll
mpath2 (3600144f0f1f2c30000004cb48f530001) dm-0 NEXENTA ,COMSTAR
[size=400G][features=0][hwhandler=0]
\_ round-robin 0 [prio=3][active]
\_ 8:0:0:0 sdg 8:96  [active][ready]
\_ 6:0:0:0 sdc 8:32  [active][ready]
\_ 7:0:0:0 sde 8:64  [active][ready

 

hdparm -tT /dev/mapper/mpath2

/dev/mapper/mpath2:
Timing cached reads:   3400 MB in  2.00 seconds = 1700.07 MB/sec
Timing buffered disk reads:  374 MB in  3.01 seconds = 124.25 MB/sec

 

dd if=/dev/zero of=test.img bs=8k count=256k
262144+0 records in
262144+0 records out
2147483648 bytes (2.1 GB) copied, 6.30386 s, 341 MB/s

 

dalsi testovani:

root@ubu:/mnt/400GB# dd if=/dev/zero of=test1.img bs=64k count=16k; sync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 2.69118 s, 399 MB/s
root@ubu:/mnt/400GB# dd if=/dev/zero of=test2.img bs=64k count=16k; sync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 3.10574 s, 346 MB/s
root@ubu:/mnt/400dd if=/dev/zero of=test3.img bs=64k count=16k; sync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 3.3932 s, 316 MB/s
root@ubu:/mnt/400GB# dd if=/dev/zero of=test4.img bs=64k count=16k; sync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 6.59781 s, 163 MB/s
root@ubu:/mnt/400GB# dd if=/dev/zero of=test5.img bs=64k count=16k; sync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 3.89086 s, 276 MB/s
root@ubu:/mnt/400GB# dd if=/dev/zero of=test6.img bs=64k count=16k; sync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 3.1554 s, 340 MB/s
root@ubu:/mnt/400GB# dd if=/dev/zero of=test7.img bs=64k count=16k; sync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 3.45733 s, 311 MB/s