[DRBD-user] slow sync speed of 12TB over 10GE

Lars Täuber taeuber at bbaw.de
Mon Jan 12 12:18:02 CET 2009


Hi Igor,

Igor Neves <igor at 3gnt.net> schrieb:
> Hi,
> 
> Are you using hardware raid under drbd device or software raid?
> 
> Cheers
> 

it is software raid6 over 15 disks with one spare. The disks are in an SAS cage connected through
LSI Logic / Symbios Logic SAS1068 PCI-X Fusion-MPT SAS controller.

# hdparm -t /dev/md4

/dev/md4:
 Timing buffered disk reads:  1102 MB in  3.01 seconds = 366.57 MB/sec
 Timing buffered disk reads:  1040 MB in  3.00 seconds = 346.63 MB/sec
 Timing buffered disk reads:  1042 MB in  3.01 seconds = 346.62 MB/sec
 Timing buffered disk reads:  1070 MB in  3.00 seconds = 356.16 MB/sec
 Timing buffered disk reads:  1078 MB in  3.00 seconds = 358.83 MB/sec
 Timing buffered disk reads:  1120 MB in  3.00 seconds = 373.25 MB/sec

# cat /proc/mdstat 
Personalities : [raid1] [raid0] [raid6] [raid5] [raid4] 
md4 : active raid6 sdc[0] sdr[15](S) sdq[14] sdp[13] sdo[12] sdn[11] sdm[10] sdl[9] sdk[8] sdj[7] sdi[6] sdh[5] sdg[4] sdf[3] sde[2] sdd[1]
      12697912448 blocks level 6, 64k chunk, algorithm 2 [15/15] [UUUUUUUUUUUUUUU]


Regards
Lars



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