RocketRaid / FakeRaid
Aug 16, 2008just bought 2 servers with same specs from FDC, called RAID1 HW with RocketRAID Controllers
but i doubt thats real HW RAID since performances sux on one of servers
here is FDISK/IOSTAT/LSPCI/PROC commands outputs for both servers
first server which seems to be OK, no any lag/iowait even at peak:
Quote:
root@server1 [~]# fdisk -l
Disk /dev/sda: 500.0 GB, 500028145664 bytes
255 heads, 63 sectors/track, 60791 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 25 200781 83 Linux
/dev/sda2 26 1069 8385930 82 Linux swap / Solaris
/dev/sda3 1070 60791 479716965 83 Linux
root@server1 [~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 444G 260G 161G 62% /
/dev/sda1 190M 16M 165M 9% /boot
tmpfs 3.9G 0 3.9G 0% /dev/shm
/usr/tmpDSK 485M 20M 440M 5% /tmp
root@server1 [~]# iostat
Linux 2.6.18-8.el5 (server1) 08/16/2008 _x86_64_
avg-cpu: %user %nice %system %iowait %steal %idle
0.33 0.06 7.94 20.87 0.00 73.97
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 205.83 6860.21 3175.99 624419964 289080668
root@server1 [~]# lspci | grep -i raid
03:00.0 SCSI storage controller: HighPoint Technologies, Inc. RocketRAID 1740 (rev 02)
root@server1 [~]# cat /proc/scsi/rr174x/0
RocketRAID 174x controller driver v1.02 (Apr 17 2007 08:55:58)
Controller 1: RocketRAID 174x Controller
------------------------------------------------
1/1/1 ST3500630AS , 500028MB, Normal [RA][WC][NCQ]
1/2/1 ST3500630AS , 500028MB, Normal [RA][WC][NCQ]
Logical devices
------------------------------------------------
[DISK 0_0] RAID_1_0 (RAID1), 500028MB, Normal
1/1/1 ST3500630AS
1/2/1 ST3500630S
You see just /dev/sda devices there
second server which lags on very little traffic, seems wrong/fake RAID to me:
Quote:
root@server2 [~]# fdisk -l
Disk /dev/sda: 500.0 GB, 500028145664 bytes
255 heads, 63 sectors/track, 60791 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 60791 488199285 8e Linux LVM
root@server2 [~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
450G 267G 160G 63% /
/dev/sda1 99M 17M 78M 18% /boot
tmpfs 3.9G 0 3.9G 0% /dev/shm
/usr/tmpDSK 485M 52M 408M 12% /tmp
root@server2 [~]# iostat
Linux 2.6.18-8.el5 (server2) 08/16/2008 _x86_64_
avg-cpu: %user %nice %system %iowait %steal %idle
3.90 5.08 8.91 19.43 0.00 65.87
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 181.08 6127.08 898.54 567307120 83196392
dm-0 267.89 6126.90 898.54 567290250 83196184
dm-1 0.00 0.01 0.00 896 168
root@server2 [~]# lspci | grep -i raid
03:00.0 SCSI storage controller: HighPoint Technologies, Inc. RocketRAID 1740 (rev 02)
root@server2 [~]# cat /proc/scsi/rr174x/0
RocketRAID 174x controller driver v1.02 (Apr 17 2007 08:55:58)
Controller 1: RocketRAID 174x Controller
------------------------------------------------
1/1/1 SAMSUNG HD501LJ , 500028MB, Normal [RA][WC][NCQ]
1/2/1 SAMSUNG HD501LJ , 500028MB, Normal [RA][WC][NCQ]
Logical devices
------------------------------------------------
[DISK 0_0] RAID_1_0 (RAID1), 500028MB, Normal
1/1/1 SAMSUNG HD501LJ
1/2/1 SAMSUNG HD501LJ
but here its mapped, i guess thats FAKE/SOFTWARE RAID