Messages in this thread | | | From | "Liang Yang" <> | Subject | Re: change strip_cache_size freeze the whole raid | Date | Mon, 22 Jan 2007 09:10:39 -0700 |
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Do we need to consider the chunk size when we adjust the value of Striped_Cache_Szie for the MD-RAID5 array?
Liang
----- Original Message ----- From: "Justin Piszcz" <jpiszcz@lucidpixels.com> To: "kyle" <kylewong@southa.com> Cc: <linux-raid@vger.kernel.org>; <linux-kernel@vger.kernel.org> Sent: Monday, January 22, 2007 5:18 AM Subject: Re: change strip_cache_size freeze the whole raid
> > > On Mon, 22 Jan 2007, kyle wrote: > >> Hi, >> >> Yesterday I tried to increase the value of strip_cache_size to see if I >> can >> get better performance or not. I increase the value from 2048 to >> something >> like 16384. After I did that, the raid5 freeze. Any proccess read / write >> to >> it stucked at D state. I tried to change it back to 2048, read >> strip_cache_active, cat /proc/mdstat, mdadm stop, etc. All didn't return >> back. >> I even cannot shutdown the machine. Finally I need to press the reset >> button >> in order to get back my control. >> >> Kernel is 2.6.17.8 x86-64, running at AMD Athlon3000+, 2GB Ram, 8 x >> Seagate >> 8200.10 250GB HDD, nvidia chipset. >> >> cat /proc/mdstat (after reboot): >> Personalities : [raid1] [raid5] [raid4] >> md1 : active raid1 hdc2[1] hda2[0] >> 6144768 blocks [2/2] [UU] >> >> md2 : active raid5 sdf1[7] sde1[6] sdd1[5] sdc1[4] sdb1[3] sda1[2] >> hdc4[1] >> hda4[0] >> 1664893440 blocks level 5, 512k chunk, algorithm 2 [8/8] [UUUUUUUU] >> >> md0 : active raid1 hdc1[1] hda1[0] >> 104320 blocks [2/2] [UU] >> >> Kyle >> >> - >> To unsubscribe from this list: send the line "unsubscribe linux-raid" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > > Yes, I noticed this bug too, if you change it too many times or change it > at the 'wrong' time, it hangs up when you echo numbr > > /proc/stripe_cache_size. > > Basically don't run it more than once and don't run it at the 'wrong' time > and it works. Not sure where the bug lies, but yeah I've seen that on 3 > different machines! > > Justin. > > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >
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