[zfs-discuss] How to verify if the ZIL is disabled
How can I verify if the ZIL has been disabled or not? I am trying to see how much benefit I might get by using an SSD as a ZIL. I disabled the ZIL via the ZFS Evil Tuning Guide: echo zil_disable/W0t1 | mdb -kw and then rebooted. However, I do not see any benefits for my NFS workload. Thanks, Scott -- This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] How to verify if the ZIL is disabled
On 09/23/09 10:59, Scott Meilicke wrote: How can I verify if the ZIL has been disabled or not? I am trying to see how much benefit I might get by using an SSD as a ZIL. I disabled the ZIL via the ZFS Evil Tuning Guide: echo zil_disable/W0t1 | mdb -kw - this only temporarily disables the zil until the reboot. In fact it has no effect unless file systems are remounted as the variable is only looked at on mount. and then rebooted. However, I do not see any benefits for my NFS workload. To set zil_disable from boot put the following in /etc/system and reboot: set zfs:zil_disable=1 Neil ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] How to verify if the ZIL is disabled
Le 23 sept. 09 à 19:07, Neil Perrin a écrit : On 09/23/09 10:59, Scott Meilicke wrote: How can I verify if the ZIL has been disabled or not? I am trying to see how much benefit I might get by using an SSD as a ZIL. I disabled the ZIL via the ZFS Evil Tuning Guide: echo zil_disable/W0t1 | mdb -kw - this only temporarily disables the zil until the reboot. In fact it has no effect unless file systems are remounted as the variable is only looked at on mount. Scott, just setting it; zfs umount xxx; zfs mount xxx and then run your experiment. Directly compare fast/incorrect xxx dataset with slower/correct yyy mount point. No need to reboot. and then rebooted. However, I do not see any benefits for my NFS workload. To set zil_disable from boot put the following in /etc/system and reboot: set zfs:zil_disable=1 Actually you need to have these 2 lines or it won't work : TEMPORARY zil disable on non-production system; Sept 23 for a test by * set zfs:zil_disable=1 -r Neil ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss smime.p7s Description: S/MIME cryptographic signature ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] How to verify if the ZIL is disabled
Thank you both, much appreciated. I ended up having to put the flag into /etc/system. When I disabled the ZIL and umount/mounted without a reboot, my ESX host would not see the NFS export, nor could I create a new NFS connection from my ESX host. I could get into the file system from the host itself of course. -Scott -- This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] How to verify if the ZIL is disabled
On 23 September, 2009 - Scott Meilicke sent me these 0,5K bytes:
Thank you both, much appreciated.
I ended up having to put the flag into /etc/system. When I disabled
the ZIL and umount/mounted without a reboot, my ESX host would not see
the NFS export, nor could I create a new NFS connection from my ESX
host. I could get into the file system from the host itself of course.
zfs share -a
/Tomas
--
Tomas Ögren, st...@acc.umu.se, http://www.acc.umu.se/~stric/
|- Student at Computing Science, University of Umeå
`- Sysadmin at {cs,acc}.umu.se
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Re: [zfs-discuss] How to verify if the ZIL is disabled
zfs share -a Ah-ha! Thanks. FYI, I got between 2.5x and 10x improvement in performance, depending on the test. So tempting :) -Scott -- This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
