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RE: extremely slow write performance plaintext

To: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Subject: RE: extremely slow write performance plaintext
From: Cory Coager <ccoager@xxxxxxxxxxxxxxx>
Date: Fri, 14 Jan 2011 00:17:52 +0000
Accept-language: en-US
Banner: Set
Cc: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
In-reply-to: <20110113233527.6dca104d@xxxxxxxxxxxxxx>
References: <3205_1294953756_4D2F6D1C_3205_1943_1_4D2F6D1C.2060409@xxxxxxxxxxxxxxx> <20110113233527.6dca104d@xxxxxxxxxxxxxx>
Thread-index: AQHLs3IsEOFR7rEIRO+fnt+mr0TVLZPPmFAw
Thread-topic: extremely slow write performance plaintext
> What is the SAS controller? the RAID controller?
HP Smart Array P600

> Please provide more details about the enclosure/drives/cabling too.
Both enclosures are HP MSA70, 25 drives each, SAS 10k rpm drives, not sure 
about the cabling (server is at another location)

> What is the kernel/distro?
SLES 10 SP2, 2.6.16.60-0.21-bigsmp, x86

> Did you striped your LVs across multiple physical volumes except the last one?
None of the LV's are stripped

> What's the output for pvdisplay, vgdisplay, lvdisplay?
# pvdisplay
  --- Physical volume ---
  PV Name               /dev/cciss/c1d0p1
  VG Name               vg0
  PV Size               2.94 TB / not usable 1.51 MB
  Allocatable           yes
  PE Size (KByte)       4096
  Total PE              769902
  Free PE               150192
  Allocated PE          619710
  PV UUID               k52E36-n3Xw-10rw-hSXo-3col-TEvC-75iHZ2

  --- Physical volume ---
  PV Name               /dev/cciss/c1d1p1
  VG Name               vg0
  PV Size               2.94 TB / not usable 1.51 MB
  Allocatable           yes
  PE Size (KByte)       4096
  Total PE              769902
  Free PE               562351
  Allocated PE          207551
  PV UUID               IAZAbk-eMNZ-puMJ-DqW1-zsC7-C0ux-66vYTN

# vgdisplay
  --- Volume group ---
  VG Name               vg0
  System ID
  Format                lvm2
  Metadata Areas        4
  Metadata Sequence No  217
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                6
  Open LV               6
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               5.87 TB
  PE Size               4.00 MB
  Total PE              1539804
  Alloc PE / Size       827261 / 3.16 TB
  Free  PE / Size       712543 / 2.72 TB
  VG UUID               p1SANa-30vR-BymQ-cOls-XeVU-92nj-YP4wSU

# lvdisplay
  --- Logical volume ---
  LV Name                /dev/vg0/apps
  VG Name                vg0
  LV UUID                LLMOor-D0mP-k2kM-qvM3-Vjse-6fE0-7DdRjJ
  LV Write Access        read/write
  LV Status              available
  # open                 2
  LV Size                348.00 MB
  Current LE             87
  Segments               2
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:0

  --- Logical volume ---
  LV Name                /dev/vg0/netlogon
  VG Name                vg0
  LV UUID                FxR324-yAH9-F6y3-Dz30-stqY-bYwc-4t6AZ7
  LV Write Access        read/write
  LV Status              available
  # open                 2
  LV Size                52.00 MB
  Current LE             13
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:1

  --- Logical volume ---
  LV Name                /dev/vg0/print
  VG Name                vg0
  LV UUID                EAISuT-a8zd-dJQa-0c6t-Zkus-I3ws-0IU9q3
  LV Write Access        read/write
  LV Status              available
  # open                 2
  LV Size                712.00 MB
  Current LE             178
  Segments               2
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:2

  --- Logical volume ---
  LV Name                /dev/vg0/sqlbackup
  VG Name                vg0
  LV UUID                22NfsZ-iqdm-jWUz-9MOW-fAh1-qfB7-nWkSSG
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                270.00 GB
  Current LE             69120
  Segments               2
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:3

  --- Logical volume ---
  LV Name                /dev/vg0/homes
  VG Name                vg0
  LV UUID                HMGhLH-0iA3-fp7n-A5Za-svJF-Tzxb-D291WR
  LV Write Access        read/write
  LV Status              available
  # open                 2
  LV Size                810.00 GB
  Current LE             207360
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:5

  --- Logical volume ---
  LV Name                /dev/vg0/shared
  VG Name                vg0
  LV UUID                Czj3gb-Adl9-FqRW-wPqH-JnW2-rDGT-toR8zL
  LV Write Access        read/write
  LV Status              available
  # open                 2
  LV Size                2.10 TB
  Current LE             550503
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:8

Keep in mind that I only have poor write performance on /dev/vg0/shared, the 
others are fine.



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