I have a pair of servers serving 10MB-100MB files. Each server has
12x 7200 SaS 750GB Drives. When I look at iostat I see the avgrq-sz
is 8.0 always. I think this has to do with the fact my LVM PE Size is
4096 with JFS on top of that. Best I can tell the fact I have so
many rrqm/s is not great and the reason I have that many is because my
avgrq-sz is 8.0. I have been trying to grasp how I should come up
with the best chunk and PE for more performance.
Switch from n2 to f2 raid10?
How do I calculate where I need to go from here with Chunk Size and PE size?
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz
avgqu-sz await svctm %util
sdf 1934.00 0.00 123.00 0.00 8.00 0.00
133.27 3.66 29.76 7.05 86.70
sdg 1765.00 0.00 117.00 0.00 7.45 0.00
130.32 3.09 29.61 7.46 87.30
sdh 1744.00 0.00 83.00 0.00 6.50 0.00 160.48
3.31 38.47 10.89 90.40
sdi 2369.00 0.00 109.00 0.00 9.50 0.00
178.42 5.30 47.83 8.65 94.30
sdj 1867.00 0.00 90.00 0.00 6.89 0.00 156.89
1.89 21.70 8.83 79.50
sdk 1574.00 0.00 74.00 0.00 6.49 0.00 179.57
2.45 34.11 11.74 86.90
sdl 2437.00 0.00 105.00 0.00 9.10 0.00
177.52 4.66 41.79 8.35 87.70
sdm 1259.00 0.00 102.00 0.00 5.22 0.00
104.86 2.19 21.34 7.99 81.50
sdn 2096.00 0.00 114.00 0.00 8.88 0.00
159.51 4.95 45.06 8.33 95.00
sdo 1835.00 0.00 106.00 0.00 7.09 0.00
137.06 2.71 24.00 8.19 86.80
sdp 1431.00 0.00 113.00 0.00 5.92 0.00
107.33 4.32 38.82 8.24 93.10
sdq 2068.00 0.00 138.00 0.00 8.39 0.00
124.46 10.18 71.28 7.04 97.10
md2 0.00 0.00 23671.00 0.00 92.46 0.00
8.00 0.00 0.00 0.00 0.00
dm-7 0.00 0.00 23671.00 0.00 92.46 0.00
8.00 1006.46 42.07 0.04 100.10
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sdf 112.00 10784.00 0.00 10784 0
sdg 111.00 10464.00 0.00 10464 0
sdh 104.00 11520.00 0.00 11520 0
sdi 98.00 14280.00 0.00 14280 0
sdj 89.00 14200.00 0.00 14200 0
sdk 79.00 6328.00 0.00 6328 0
sdl 113.00 11296.00 0.00 11296 0
sdm 74.00 7504.00 0.00 7504 0
sdn 109.00 11840.00 0.00 11840 0
sdo 113.00 15488.00 0.00 15488 0
sdp 107.00 9928.00 0.00 9928 0
sdq 109.00 10656.00 0.00 10656 0
md2 16937.00 135496.00 0.00 135496 0
dm-7 16937.00 135496.00 0.00 135496 0
Personalities : [raid10]
md2 : active raid10 sdf[0] sdq[11] sdp[10] sdo[9] sdn[8] sdm[7] sdl[6]
sdk[5] sdj[4] sdi[3] sdh[2] sdg[1]
4395442176 blocks super 1.2 1024K chunks 2 near-copies [12/12]
[UUUUUUUUUUUU]
--- Physical volume ---
PV Name /dev/md2
VG Name storage
PV Size 4.09 TB / not usable 4.00 MB
Allocatable yes (but full)
PE Size (KByte) 4096
Total PE 1073105
Free PE 0
Allocated PE 1073105
PV UUID SwNPeb-QHqH-evb3-sdDM-el7V-
NfQl-HJijzQ
12x Vendor: SEAGATE Model: ST3750630SS
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