M3kk

1 Volume but /dev/md3 ? Why?

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Hello, i have a HP Gen8 Microserver with 4x3TB HDDs in SHR. I have only one Volume (Volume1), but i have /dev/md3 too, why? Its normal?

 

Gen8_NAS> cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md3 : active raid5 sdb6[3] sdd6[0] sdc6[2] sda6[1]
     1953292672 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/4] [uUUU]
     [>....................]  reshape =  4.2% (41991036/976646336) finish=328.3min speed=47438K/sec

md2 : active raid5 sdb5[7] sda5[5] sdd5[4] sdc5[6]
     5846338944 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/4] [uUUU]

md1 : active raid1 sdb2[3] sdd2[2] sdc2[1] sda2[0]
     2097088 blocks [12/4] [uUUU________]

md0 : active raid1 sdb1[1] sda1[0] sdc1[2] sdd1[3]
     2490176 blocks [12/4] [uUUU________]

unused devices: 

 

PS: Hes rebuilding, because i had 4x2T, and i swaped them 1by 1 with the 3T ones (this is the last 3T one).. Until the 3th 3T i had md0, md1, and md2, not md3 too.

At other Gen8, where i have 4x 3T from start i have this:

 

Nas> cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md2 : active raid5 sda5[0] sdd5[3] sdc5[2] sdb5[1]
     8776594944 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/4] [uUUU]

md1 : active raid1 sda2[0] sdb2[1] sdc2[2] sdd2[3]
     2097088 blocks [12/4] [uUUU________]

md0 : active raid1 sda1[0] sdb1[1] sdc1[2] sdd1[3]
     2490176 blocks [12/4] [uUUU________]

unused devices: 

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Also, the rebuild for the MD2 was ~180xxx K/sec, but here is only ~45K-50K/sec. Why?

 

PS: i modified the /proc/sys/dev/raid/speed_limit_max and /proc/sys/dev/raid/speed_limit_min values to 300000 .

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MD0 = Mirror raid where the OS resides

MD1 = Mirror Raid where the swap files lives

MD2 = Raid 5 Array where your volume lives

 

No somethings gone amiss there I would guess, and as such the reason you have such slow access times.

 

I would wipe the drives completely and start again.....

 

were these drives previously used in a mdadm array in another OS??

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My issue is with md3. And no they were all new hdds.. why my volume1 lives in 2 mds? This is the question..

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