Re: Reiserfs Sloooow Boot

[Edward Shishkin <edward@namesys.com>]

Ricardo (Tru64 User) wrote:

>Hi Guys,
>First time posting here...after spending couple hours
>in the mail archives.
>I am running mandrake 10, 10.1 with reiserfs 3.6.11 
>I have used reiserfs for a number of years...previous
>with mandrake 8,9,9.2 (not sure what version of
>reiserfs was in use then).
>Since converting all nodes to Mandrake 10.0,(comes
>with reiserfs 3.6.110, reboots (even clean ones) are
>painfully sloooow!
>
>For an empty reiserfs filesystem, 2TB in size, it
>takes about 7-10mins to complete:
>May 25 11:02:20 node2 kernel: reiserfs: found format
>"3.6" with standard journal
>May 25 11:04:22 node2 kernel: reiserfs: checking
>transaction log (device sd(8,17)) ...
>May 25 11:04:22 node2 kernel: for (sd(8,17))
>May 25 11:04:22 node2 kernel: sd(8,17):Using r5 hash
>to sort names
>--------------------------
>
>I have another empty filesystem created on a Logical
>Volume (LV), that is 5TB. That one takes about 15-20
>minutes to boot+mount!!
>  
>

This is because reiserfs load all bitmap blocks at mount time.
It seems 15 min is a minimal time we can provide for you: 5TB
means that reiserfs needs to read more then 40 000  bitmap
blocks.

>This was not the case in previous installs, where my
>largest filesystems were 1TB. 
>Does reiserfs have performance limitations with
>filesystem size?
>
>I took on XFS for trial purpose....formating the same
>5TB partition with XFS, and reboots are extremely
>quick! Barely two minutes, node is up, vs. 15 minutes
>with reiserfs.
>  
>
Quick mount of 5TB means slowdown of other things.
Reiser4 has a mount option which allows to load bitmap blocks
dynamically if you prefer to wait for other blocks next time when
it is needed..

Edward.

>Any tweaking recommendations? More info that I should
>provide? Hardware is a mix of promise technologies
>(ATA to SCSI) raid boxes, and EonStor (SATA to SCSI)
>raid boxes, some using LSI logic card as HBA, and
>others using adaptec 39160, same issue. 
>Server hardware is Dell PowerEdge 1750, 4GB ram, Dual
>Xeon 3.2 processors.
>
>I am hoping someone will lead me to some tuning to
>reduce this delay. I can't use xfs, since on some
>nodes i have to use kernel 2.4.26 (vanilla) that
>doesnt support xfs, and besides, I have been a default
>reiserfs user for a while, so I am not about to start
>converting all 20-30TB paritions into XFS. For now, I
>prepare 30mins for reboot whenever i have too...which
>means they cant happen on work week, otherwise too
>much cursing will occur.
>
>I am using reiserfs for all partitions, including
>root. Delay is much noticeable on the external
>devices, which are the largest partitions.
>
>_Thanks
>
>Richard
>
>
>
>More info that might be helpful::
>
>]# debugreiserfs /dev/sdb1
>debugreiserfs 3.6.11 (2003 www.namesys.com)
>
>
>Filesystem state: consistency is not checked after
>last mounting
>
>Reiserfs super block in block 16 on 0x811 of format
>3.6 with standard journal
>Count of blocks on the device: 524287996
>Number of bitmaps: 16000
>Blocksize: 4096
>Free blocks (count of blocks - used [journal, bitmaps,
>data, reserved] blocks): 521696895
>Root block: 457391
>Filesystem is NOT cleanly umounted
>Tree height: 5
>Hash function used to sort names: "r5"
>Objectid map size 2, max 972
>Journal parameters:
>        Device [0x0]
>        Magic [0x36901ac5]
>        Size 8193 blocks (including 1 for journal
>header) (first block 18)
>        Max transaction length 1024 blocks
>        Max batch size 900 blocks
>        Max commit age 30
>Blocks reserved by journal: 0
>Fs state field: 0x0:
>sb_version: 2
>inode generation number: 1
>UUID: d1e512ee-d5b7-41f9-a0cc-1cc99b58f587
>LABEL: 
>Set flags in SB:
>        ATTRIBUTES CLEAN
>
>
>
>		
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>  
>